Finishing
Epoxy resin coating for 3D printed parts
Seals the surface and adds a hard shell. Sealed parts resist water and fluids.
- Unchanged
- Part geometry apart from a thin film
- Strength
- Adds surface stiffness and hardness
Finish profile
Properties added
- Surface finishSmooth, glossy film
- StrengthAdds surface stiffness and hardness
- Water resistanceCloses layer-line gaps and pores
- Chemical resistanceGood against many fluids; check yours
- Wear / abrasionHard surface layer
- Colour / lookClear or pigmented
- Electrical conductivityUnchanged
Trade-offs
- Dimensional changeFilm adds thickness
- Lead-time impactCure time dominates
Typical values on a 0 to 4 scale.
Suitable materials
- FDMSeals layer lines
- SLS nylonSeals the grainy surface
- SLASuitable
- PolyJetSuitable
- Flexible TPUSuits rigid parts
Epoxy resin coating specification
| Used for | Sealing, waterproofing, surface hardening |
|---|---|
| Film | Adds thickness; allow for it on mating faces |
| Pressure or fluid parts | Pressure-test the part to confirm the seal |
| Colour | Clear or pigmented |
Epoxy resin coating FAQ
Will it make my part watertight?
It seals layer-line gaps and surface pores. Pressure-test fluid parts to confirm the seal.
Does epoxy make the part stronger?
It adds a hard, stiff skin at the surface. Bulk strength stays with the printed material.
Does it change dimensions?
Yes, it adds a film. Allow for it on mating faces.
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Related guides
Process pages: FDM 3D printing, SLA 3D printing, SLS 3D printing. Material data: 3D printing materials.
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