Unleash creativity: The ultimate guide to choosing the best coating for 3D printing
(…and why completion is more important than you think)
As additive manufacturing evolves, 3D printing has moved from functional prototypes to end-use products. However, even the most intricate designs can fail without professional polish. At GreatLight, we have spent several years refining metal and polymer reprocessing technologies for aerospace, automotive and consumer products customers. Here’s our expertise in selecting and applying coatings to make your 3D printed creations stand out.
Why painting is not 3D printing "Just decoration"
Painting is not just aesthetic – it is a functional enhancement. For PLA, ABS or resin prints and coatings:
- seal porosity (especially in FDM layer)
- Protects against UV degradation and moisture
- Achieve color accuracy for brand or realism
- Hide layer lines When used in combination with primer
Key insights: At GreatLight, we often combine vapor smoothing with an epoxy coating before painting metal SLS parts. This prevents corrosion and ensures perfect adhesion of metallic pigments.
Key factors when choosing coatings
1. Material compatibility
- People’s Liberation Army: Avoid acetone-based paints (risk of melting). Use acrylics or water-based enamels.
- ABS/Nylon: Compatible with most solvents (enamels, varnishes).
- Resin (SLA/DLP): Acrylic is preferred; test the solvent on waste resin first.
- Metal Prints: Aluminum/steel must be coated with etching primer to prevent peeling.
2. Surface treatment type
- Matte: Hide imperfections; ideal for functional parts.
- Glossiness: Highlights details; requires perfect finish.
- Texture: Hammered or stone veneer covers layer lines.
3. Application method
| method | most suitable | Skill level | For tips |
|---|---|---|---|
| spray can | large surface | beginner | Put the can in water and heat it to make the water flow smoother |
| spray gun | gradient/detail | advanced | Thin paint to milk consistency |
| brush | Modify | all | Use synthetic acrylic brushes |
