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⚡ Quick Picks at a Glance
- Best Foamboard for Beginners: Readi-Board 20″×30″ White Foam Board 25-Pack
- Best for FT Plans & Scratch Builds: Flite Test Water-Resistant Foam Board by Adams
- Best EPP (Crash-Proof Builds): The Foam Factory 1.3 lb EPP Foam Sheets
- Best Rigid Sheet (Precision Models): Depron 6mm Aeromodelling Foam (via specialty supplier)
- Best Budget Rigid Foam: Owens Corning FOAMULAR 150 XPS Pink Board (hardware stores / Amazon)
- Best Hot Wire Cutter: GOCHANGE 4-in-1 Foam Cutter Set — 18W Electric
Foam changed everything for me when I got back into this hobby after a long gap. I’d been a balsa guy for years — still love the stuff — but watching a mate build and fly a complete park flyer in a single weekend out of dollar store foam board? That was honestly a bit of a revelation. I went from “that doesn’t look serious enough” to “wait, this thing actually flies great and I can repair it with tape” pretty fast.
Thing is, once you go down the foam rabbit hole you quickly discover there isn’t just one foam. There’s a whole family of them — EPP, Depron, XPS insulation board, paper-backed foamboard — and each one behaves completely differently in your hands, under aerodynamic loads, and when it inevitably meets the ground harder than planned. Pick the wrong type and your model is either too fragile, too heavy, or just a pain to work with. Pick right and it genuinely feels like cheating compared to a full balsa build.
This guide breaks down every foam type you’ll come across as an RC builder. I cover what each one actually is, where it shines, where it’ll let you down, and which specific products are worth having in your workshop. There’s a mix of Amazon links and honest pointers to specialist suppliers where Amazon falls short — because that does happen with some of the better foams.
The Four Foam Types You Actually Need to Know
Before we get into individual products it’s worth a quick overview, because the terminology gets confusing pretty quickly — especially with brands sometimes using the same words for different things.
Foamboard (DTFB / Adams Readi-Board) is a polystyrene foam core sandwiched between two paper facings. The paper adds stiffness and makes it easy to paint and finish. It’s the foundation of the entire Flite Test movement. Cheap, fast to build with, widely available. The paper also lets you score and fold — incredibly handy for control surfaces and compound curves.
EPP (Expanded Polypropylene) is a rubbery, flexible closed-cell foam. It bounces back after impacts that would shatter anything else. If you’re still learning to land or you want a plane that survives regular bashing around, EPP is your material. The downside: it’s harder to get a clean edge, doesn’t cut as crisply, and bonds differently than other foams.
Depron is a brand name for a fine-cell extruded polystyrene foam. Rigid, smooth-surfaced, incredibly light for its stiffness. The stuff of aerobatic and indoor models. Cuts like a dream with a sharp knife but will crack rather than bend when you crash — so it rewards pilot skill rather than tolerating the lack of it.
XPS (Extruded Polystyrene) — the “pink board” or “blue board” from hardware stores — is essentially the same base material as Depron but in thicker insulation sheet form. Cheaper than any hobby-specific foam, great for hot-wire cutting wings and fuselage cores, and big enough sheets to build large aircraft from. Slightly less refined than Depron but completely adequate for outdoor sport models.
How to Choose the Right Foam for Your Build
Experience level matters a lot here. If you’re fairly new to this, foamboard or EPP will serve you much better than Depron. The crashes are less expensive, the repairs are quicker, and you still end up with something that flies properly. Depron is brilliant once you’ve got enough stick time to not be scaring yourself on every flight.
What you’re building matters too. A flying wing is almost always EPP or XPS — the whole-fuselage-is-the-wing design suits those materials perfectly. A scale warbird replica benefits from Depron’s clean surface. A Flite Test speed build is obviously foamboard. An indoor 3D aerobat? 3mm Depron, full stop.
Think about your glue situation before you buy foam. This catches people out constantly. Standard CA (super glue) will melt XPS and Depron instantly. You need foam-safe CA, Gorilla Glue, or water-based contact cement depending on what you’re bonding. The Best Glue for RC Airplanes guide covers this in detail — it’s worth reading before you have a pile of foam and the wrong adhesives.
Density = weight. Lighter foam means lower wing loading and slower, more forgiving flight characteristics — which is almost always what you want for a trainer or a park flyer. Heavier foam means more durable structure but a heavier airframe that needs more power to fly well. The density specs I include with each product below matter, don’t ignore them.
Section 1 — Foamboard: The Fastest Way to Get Flying
If you haven’t built a Flite Test design yet, you probably will at some point — there are hundreds of free plans, an enormous community, and build videos for everything. Foamboard is the required material. Even if you never touch an FT plan, paper-backed foamboard is genuinely the best material for quick scratch builds and prototyping new designs. You can go from an idea to something airborne in a day.
The key technique to know upfront: scoring the paper on one side and then bending creates a living hinge — this is how you make control surfaces and wing leading-edge curves without cutting all the way through. It’s clever design that makes construction fast and surprisingly strong.
🥇 1. Readi-Board 20″×30″×3/16″ White Foam Board — 25-Count Pack
This is the one. The Adams Readi-Board — also called Dollar Tree foam board or DTFB in the Flite Test community — has become the de facto standard for foam scratch building in North America. The 25-pack is the way to buy it on Amazon; individual sheets work out noticeably more expensive and you’ll go through more than you expect once you’re properly addicted to building.
Each sheet is 20″×30″×3/16″ (5mm). The polystyrene core is consistent and light, the paper facing peels cleanly when you score it (important for the folding technique), and the whole sheet weighs around 35g — low enough that a complete small aircraft airframe comes in well under 150g before any electronics.
One thing worth knowing: outside the US, this exact product isn’t always easy to find, and heavier foam boards that look identical will mess with your CG calculations on any FT plan. If you can get the genuine Adams Readi-Board, buy in bulk.
- Specs: 20″×30″×3/16″ | 25 sheets | Paper-faced polystyrene | ~35g per sheet
- Best for: Flite Test plans, quick scratch builds, first foam aircraft, budget trainer construction
- Builder feedback: The backbone of an enormous community. Consistently rated 4.5+ stars and routinely described as “the best value in RC building materials.”
- Price: ~$28–35/25-pack (check Amazon for current pricing)
2. Readi-Board 20″×30″×3/16″ White Foam Board — 10-Count Pack
Same product as above, 10-sheet version. Good entry point if you want to try it before committing to a full box, or if you’re just building one aircraft and don’t need workshop stock. Slightly worse value per sheet but still reasonable.
- Specs: 20″×30″×3/16″ | 10 sheets | Paper-faced polystyrene
- Best for: First-time buyers, single aircraft builds, topping up stock
- Price: ~$14–18/10-pack (check Amazon for current pricing)
3. Flite Test Water-Resistant Foam Board by Adams — 20-Pack
This is the upgraded version of the Readi-Board concept — same Adams manufacturing, but the paper facing is coated for water resistance. The difference shows up quickly: standard foamboard starts to delaminate and warp in humid conditions or after a wet-grass landing. This stuff handles it without the drama. The facing is also a bright, clean white that takes acrylic paint and decals far better than the standard grey-ish paper.
It’s sold through the Flite Test store and some Amazon resellers. Costs more than standard Readi-Board but if you’re going to be flying regularly and leaving models in a car boot or a garden shed, it genuinely pays for itself in planes that don’t need rebuilding after a damp week.
- Specs: 20″×30″×3/16″ | 20 sheets | Water-resistant paper-faced polystyrene
- Best for: Serious scratch builders, FT plans, humid climates, outdoor storage situations
- Builder feedback: Strong reviews from builders who previously lost models to delamination. The paint adhesion improvement is noted consistently.
- Price: ~$45–55/20-pack (check Amazon or store.flitetest.com for current pricing)
Section 2 — EPP Foam: Build It Once, Crash It Many Times
I’ll be straight with you — EPP foam is not the prettiest material to work with. The edges are slightly fuzzy, it doesn’t take paint as cleanly as Depron, and you can’t hot-wire cut it (the polypropylene melts instead of vaporising). But if you’ve ever watched someone fly an EPP foamie into a tree, bounce off, and fly away? That’s a material with a genuine superpower.
EPP is the go-to for trainer aircraft, flying wings (which by definition crash a lot during the learning curve), and combat flying where mid-air collisions are the whole point. At 1.3 lb/ft³ density it’s extraordinarily light for how tough it is. I’ve seen models take impacts that would have turned a balsa plane into expensive splinters, shrug it off with a minor dent, and keep flying.
The technique for EPP is different: use a sharp serrated knife or bandsaw rather than a hot wire, bond with contact cement or UHU Por rather than CA, and plan for a rougher surface finish that you’ll need to work harder to get looking good. Worth every bit of the extra effort for the right type of model.
🥇 4. The Foam Factory — 1.3 lb EPP Foam Sheets (Multiple Sizes Available)
The Foam Factory is the most consistently recommended US source for EPP foam across RC building forums and communities. Their 1.3 lb/ft³ density sheets hit the sweet spot — light enough for proper flight performance on a park flyer or trainer, dense enough to hold control surface cutouts cleanly and resist permanent deformation under aerodynamic load.
Sheets come in various sizes from 12″×12″ up to 24″×48″, and in thicknesses ranging from 1/4″ (6mm) through 2″ (50mm). For most RC airplane builds you’re looking at 6–12mm thick sheets for wing skins and fuselage panels. The thicker 25–50mm options are useful for wing cores on flying wings where you want to carve airfoil profiles.
It’s available both through their own site (thefoamfactory.com) and through Amazon sellers. The Amazon listings vary in availability, so if Amazon shows out of stock, go direct — they ship quickly and the quality is consistent batch to batch, which matters when you’re building a fleet.
- Specs: 1.3 lb/ft³ density | Available 12″×12″ to 24″×48″ | Multiple thicknesses | Made in USA
- Best for: Trainer aircraft, flying wings, aerobatic park flyers, combat models, beginner-friendly builds
- Builder feedback: The community standard for EPP. Praised for consistent density and clean cut quality with a sharp blade.
- Price: ~$8–20 depending on sheet size (check Amazon for current pricing)
5. GOCHANGE 4-in-1 Electric Foam Cutter Set — 18W (Essential Tool for Foam Builders)
Strictly speaking this is a tool, not a foam — but you basically can’t build with XPS or Depron without one, and it comes up every single time foam building is discussed, so it’s going in here. The GOCHANGE 4-in-1 kit is consistently the best-reviewed entry-level hot wire cutter on Amazon for hobby foam work.
The set includes a pen-style cutter, a table bow cutter, a foam ball cutter, and a carving attachment. The 18W transformer gives you enough temperature control to cut cleanly through 6mm and 12mm XPS without melting the edges into rounded mush — which is the problem with underpowered cutters. The pen attachment handles freehand curves and detail cuts; the bow handles straight cuts on larger panels.
One critical note: this works brilliantly on XPS and Depron. Do not use it on EPP foam — EPP is polypropylene and will melt rather than cut cleanly. EPP needs a knife or bandsaw.
- Specs: 18W | 4 attachments (pen, bow, ball cutter, carving tip) | Variable temperature
- Best for: XPS wing core cutting, Depron scratch builds, airfoil profiling, fuselage shaping
- Builder feedback: 4.4 stars, 1,000+ reviews. Regularly described as “the best value foam cutter for hobby use.” Temperature control is highlighted as the key advantage over cheaper single-temp units.
- Price: ~$22–28 (check Amazon for current pricing)
Section 3 — Depron: When You Want a Proper Model, Not Just Something That Flies
Depron is the foam that makes builders who’ve only used foamboard say “oh, so this is what the fuss is about.” It’s a fine-cell extruded polystyrene with a smooth, dense surface that cuts crisp edges, sands beautifully, and produces models that look like proper aircraft rather than things built from office supplies.
The stiffness is the main thing. 6mm Depron is rigid enough that wings up to about 600mm span don’t need a spar — the foam itself handles the bending loads. That simplifies construction enormously. The weight is also excellent: a 6mm Depron sheet goes maybe 80–100g/m², which is lighter than most paper-covered foamboards.
The honest downside is availability. Depron in the traditional 1000×800mm hobby sheet format is harder to source than it used to be. In the US the best sources are specialty RC suppliers like rcdepron.com rather than Amazon directly. That’s the trade-off you accept for a material this good.
🥇 6. Depron Aero 6mm Foam Sheets — 1000mm×800mm
Depron Aero is the version of Depron specifically manufactured for the hobby market — finer cell structure, more consistent density, and cleaner surface than the standard building insulation version. The 6mm thickness is the one to start with: versatile enough for fuselage panels, wing skins on smaller models, and control surfaces, while being rigid enough to build without additional spars on most park-scale designs.
Available in white (slightly lighter) and grey (slightly stiffer). For most RC builds white is fine. If you’re building for competition aerobatics where every gram matters, white. If you’re building a model that’ll take some knocks, grey.
Primary source is rcdepron.com for US buyers. Some Amazon third-party sellers list it; check that you’re getting the full 1000×800mm sheet size and not a smaller cut piece at an inflated price.
- Specs: 6mm thick | 1000mm×800mm sheet | Available white or grey | Fine-cell extruded polystyrene
- Best for: Aerobatic park flyers, scale models, indoor slow flyers, precision scratch builds
- Builder feedback: The serious builder’s foam. Universally praised for consistency and workability.
- Price: ~$8–12 per sheet (check Amazon or rcdepron.com for current pricing)
7. Depron 3mm Foam Sheets — Indoor & Ultra-Light Models
3mm Depron is a speciality material for indoor flying models and competition F3P aerobatics — the discipline where pilots fly incredibly precise sequences in a gymnasium. Models built from 3mm Depron weigh practically nothing. A complete indoor model with motor, battery, and receiver can come in under 60g. At that weight, indoor aerobatics and slow-speed hovering are possible with very modest motors.
Not the right call for outdoor flying unless you’re building very small and flying in dead calm. Any meaningful wind will cart a 3mm Depron model around in ways that are more stressful than fun. But for what it’s designed for — indoor slow flight and precision aerobatics — there’s nothing else.
- Specs: 3mm thick | 1000mm×800mm sheet | Very low mass | Fine-cell extruded polystyrene
- Best for: Indoor aerobatics (F3P), micro models, ultra-light slow flyers
- Price: ~$7–10 per sheet (check specialist RC suppliers or Amazon third-party sellers)
Section 4 — XPS Foam: Big Sheets, Low Price, Surprisingly Good
Here’s one of the best kept secrets in foam RC building that isn’t actually much of a secret anymore: the pink and blue insulation board from your local hardware store is excellent model building material. It’s just XPS — extruded polystyrene — the same base material as Depron, but in thick building-insulation format.
Owens Corning FOAMULAR 150 (the pink one) and Dow Styrofoam (the blue one) are the two main brands in the US. A 4’×8′ sheet at 1/2″ thick from Home Depot costs a few dollars and yields enough material for multiple complete aircraft. It hot-wires beautifully, sands well, accepts foam-safe CA, and gives you large format sheets you simply can’t get from hobby-specific products at any reasonable price.
The catches: you need foam-safe adhesives (standard CA and solvent-based paints will dissolve it instantly), and the surface is slightly coarser than Depron, which means more finishing work for scale models. For outdoor sport flyers and flying wings though? Honestly a bit of a no-brainer.
🥇 8. Owens Corning FOAMULAR 150 XPS Insulation Board — 1/2″ × 4′ × 8′ (Pink Board)
FOAMULAR 150 is the most widely used XPS board in US RC building communities. The 1/2″ (12.7mm) thickness is the sweet spot — stiff enough to use as wing skins and fuselage panels, thin enough to cut with a sharp knife or hot wire without a lot of effort. Available in-store at Home Depot and Lowe’s for the best price; it also shows up on Amazon through various sellers though shipping costs for large sheet materials can make in-store pickup the smarter option.
The pink colour is genuinely useful — pencil marks show clearly, Sharpie templates are easy to read, and it looks good in build photos. The surface hot-wires to a smooth, sealed finish that needs minimal sanding before covering or painting.
- Specs: 1/2″ (12.7mm) thick | 4’×8′ sheet | 1.5 lb/ft³ XPS | Pink, closed-cell
- Best for: Flying wings, large wingspan scratch builds, hot-wire cut airfoil cores, value workshop stock
- Builder feedback: The community favourite for large builds. “Best value foam for RC” comes up repeatedly in forums.
- Price: ~$15–22/sheet in-store | Higher on Amazon due to shipping (in-store usually better value for large sheets)
9. Dow Styrofoam Insulation Board — 1/2″ Blue Board
Dow’s blue equivalent to the pink FOAMULAR. Performs almost identically for RC building purposes — same XPS chemistry, same hot-wire behaviour, same adhesive requirements. Slightly finer cell structure than FOAMULAR according to builders who’ve tested both extensively, but in practice the difference is minimal. Availability varies by region; some builders have consistent access to blue, others to pink. Either works.
What to actively avoid: white EPS bead foam — the kind used in coffee cups and cheap coolers. That stuff crumbles when you cut it and has no place in a model aircraft. XPS (pink or blue) is the one you want, not EPS.
- Specs: 1/2″ thick | Available in 4’×8′ and smaller sheets | Closed-cell XPS | Blue
- Best for: Same applications as pink FOAMULAR — wherever you have better local access to blue
- Price: ~$15–22/sheet in-store (check local Lowe’s or Amazon for current pricing)
Section 5 — Foam-Safe Adhesives: The Critical Supporting Cast
No foam article is complete without addressing adhesives, because the wrong glue is the fastest way to destroy both your material and your afternoon. Standard solvent-based CA (super glue) will dissolve XPS and Depron on contact. Aerosol spray paints that aren’t water-based will do the same thing. Builders learn this the hard way and it’s painful to watch — so here’s the brief version.
🥇 10. Bob Smith Industries FOAM-CURE Foam-Safe CA Glue — Medium Viscosity
Bob Smith Industries make what is generally considered the best foam-safe CA on the market. FOAM-CURE is specifically formulated not to attack the cell structure of polystyrene and polypropylene foams — it bonds without the white frosting or foam dissolution you get from standard CA. Medium viscosity is the one to start with: thin enough to wick into joints, thick enough to fill slight gaps.
Works on Depron, XPS, foamboard, and most RC-relevant foam types. Not specifically formulated for EPP — for EPP you’re better off with UHU Por or contact cement — but for everything else this is the one to reach for. Cures in 10–30 seconds, full strength in a few minutes.
- Specs: Medium viscosity | Foam-safe formula | 1 oz bottle | Sets in 10–30 seconds
- Best for: Depron, XPS, foamboard joints, hinges, wing spar gluing, fuselage assembly
- Builder feedback: The standard foam CA recommendation across RC forums and build threads. Consistently 4.5+ stars.
- Price: ~$8–12 (check Amazon for current pricing)
11. UHU Por Contact Cement — Foam-Safe, Flexible Bond for EPP
UHU Por is the go-to adhesive specifically for EPP foam builds. Where CA cures rigid and can crack under the flex of EPP material, UHU Por remains slightly flexible after curing — matching the behaviour of the foam itself. Apply to both surfaces, let tack up for 30–60 seconds, then press together. The bond is strong, the flex is retained, and it doesn’t attack EPP chemistry.
Also works well on foamboard and for paper-to-foam lamination. Not ideal for hard point connections (firewall, motor mount) where you’d use epoxy regardless, but for everything that’s going to flex and flex and flex, UHU Por is what you want.
- Specs: Contact cement | Flexible cure | Foam-safe | 50ml tube
- Best for: EPP foam assembly, flexible joints, foamboard paper-side bonding
- Builder feedback: Standard recommendation in EPP builder communities. Specifically valued for the flexible cure on crash-resistant builds.
- Price: ~$7–11 (check Amazon for current pricing)
12. Gorilla Glue Original — Expanding Polyurethane (Works on Most Foam)
Gorilla Glue expands as it cures — which sounds alarming but is actually useful for filling slight gaps in foam joints where surfaces aren’t perfectly flat. It’s foam-safe, bonds well to XPS and EPP, and the structural strength once cured is excellent for hard points like firewall doublers and nose blocks. Use it sparingly — a little goes a long way — and clamp or tape while it cures to control the expansion direction.
- Specs: Expanding polyurethane | Waterproof | 4 oz bottle | 24-hour full cure
- Best for: Structural hard points, gap-filling joints, motor mounts, firewall doublers
- Price: ~$8–12 (check Amazon for current pricing)
Quick Comparison Table
| Material | Best For | Crash Resistance | Surface Quality | Cost |
|---|---|---|---|---|
| Readi-Board DTFB | FT plans, first builds, prototyping | Moderate | Good (paper-faced) | $ (cheapest) |
| EPP 1.3 lb/ft³ | Trainers, flying wings, combat | Excellent | Rough (needs work) | $$ |
| Depron 6mm | Aerobatics, scale, indoor | Low (cracks) | Excellent | $$$ |
| Depron 3mm | Indoor, micro models, F3P | Very low | Excellent | $$$ |
| XPS / FOAMULAR 150 | Large builds, flying wings, hot-wire work | Moderate | Good | $ (hardware stores) |
Prices are approximate — click links for current Amazon pricing.
Frequently Asked Questions
Can I use regular CA glue on foam?
No — and this one catches people out regularly. Standard CA (cyanoacrylate super glue) contains acetone-adjacent solvents that will dissolve XPS, Depron, and EPS foam on contact. You need foam-safe CA specifically, like Bob Smith Industries FOAM-CURE. The exception is EPP foam, which is polypropylene-based and isn’t dissolved by standard CA, but the bond quality is poor regardless. Use UHU Por or contact cement for EPP.
What’s the difference between EPS and XPS foam?
EPS is the white beaded foam used in coffee cups, cheap coolers, and packaging — the stuff that crumbles into tiny balls when you cut it. XPS is extruded polystyrene — denser, smoother, closed-cell, the pink or blue insulation board from hardware stores. They look vaguely similar but perform completely differently. For RC building, you always want XPS. EPS has almost no useful applications in model aircraft construction.
Can I spray paint foam models?
Depends entirely on the paint. Most aerosol spray paints contain solvents that will dissolve polystyrene foam (including XPS and Depron) very quickly. Water-based acrylic paints — applied by brush or airbrush — are safe on all foam types. Some specific aerosol paints are foam-safe; Rustoleum 2X paint and primer in a can is not (it’ll eat right through). When in doubt, test on scrap first. Paper-covered foamboard is more tolerant of spray paint than bare foam.
Which foam should I start with as a complete beginner?
Foamboard (Adams Readi-Board / Dollar Tree foam board) without a doubt. It’s cheap enough that mistakes don’t hurt, widely available, and the entire Flite Test library of plans is designed around it. Start with an FT Flyer or FT Old Fogey, follow the build video, and you’ll be flying within a day or two for well under $50 in materials. Once you’ve built a few and understand how foam models fly and fail, you’ll have a much better sense of whether EPP, Depron, or XPS fits what you want to build next.
Is Depron worth the extra cost over foamboard?
For the right type of model, absolutely. If you’re building a precision aerobat, an indoor slow flyer, or any model where surface quality and stiffness matter, Depron produces a noticeably better result than foamboard. For quick park flyers and trainers where you don’t mind patching up after a rough landing? Foamboard is smarter. The honest answer is most active builders end up using both — foamboard for fun sport builds, Depron when they want to build something they’re properly proud of.
Final Thoughts
If I’m being completely straight with you — and I might as well be — most of what I’ve built in the last few years has been foamboard and EPP with the occasional Depron project when I want something that looks the part at the field. The cost argument for foamboard is pretty much unanswerable when you’re starting out, and EPP for trainers just makes sense when you factor in the cost of rebuilding balsa every time a beginner (or an over-confident intermediate) gets the approach wrong.
The smart move is to stock a bit of each: a 25-pack of Readi-Board for regular builds and prototyping, some EPP sheets in a couple of thicknesses for the trainers and wings, and a handful of Depron sheets for the model you actually want to be proud of. Total outlay is well under $100 and you’ll be set for months of building.
Get the foam-safe glue sorted before you start — seriously, the number of builds I’ve seen ruined by the wrong adhesive is depressing. And if you’re cutting XPS or Depron, the GOCHANGE hot wire cutter is money well spent.
Continue Reading — Related Guides
- 🔗 Best Glue for RC Airplanes: CA, Epoxy & Foam-Safe Adhesives — Full breakdown of which adhesive goes with which foam type
- 🔗 Best Balsa Wood for RC Airplanes: Sheets, Strips & Blocks — Traditional materials guide if foam isn’t your thing
- 🔗 Carbon Fiber Rods, Tubes & Sheets for RC Planes — How to reinforce foam models with CF spars and strips
- 🔗 Best RC Airplane Kits: Balsa to Foam, Beginner to Expert — Pre-cut foam kits if you want a head start
- 🔗 RC Airplane Materials List — Full overview of everything you need to build from scratch
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