How should I surface finish 3D printed plastic parts?

Choosing the Right Surface Coating

For a professional, glossy look that also preserves the intricate details of your print, a thin topcoat of epoxy is highly effective. 3D Finish Fast Coating Epoxy Resin is specially designed for this purpose, bonding seamlessly with common 3D print plastics like PLA and ABS. Its non-drip formula smooths out visible layer lines and sets quickly, providing a robust surface that’s easy to polish or paint.

Preparation and Application Tips

• Ensure your 3D print is dust-free and dry before starting. Lightly sanding the surface with fine-grit paper can help remove larger texture ridges and improve adhesion.
• Apply the epoxy coating evenly using a soft brush. Avoid overloading the surface, as too much can fill in fine details.
• Allow the coating to cure as directed (about four hours with most fast-setting formulas), then assess if a second layer is needed for additional gloss or smoothness.

Adding Colour and Decorative Effects

Once the surface is smooth and fully cured, your piece is ready for colour. Alcohol inks such as Jacquard Pinata can be used to achieve vibrant, translucent effects. For a more traditional finish, the coated part can be primed and painted with acrylics or metallic enamels suitable for plastics. This flexibility allows for a broad range of creative finishes, from high-shine to custom pigment blends.