PRINTVAULT GUIDE

Finish and paint an FDM print

PrintVault’s FDM products are printed in PLA and normally supplied unpainted. This guide takes you from the raw print to a smooth painted display finish.

1. 01

   Check and dry-fit every part

   Lay out the pieces and compare them with the product photos. Test the fit before using glue. Remove any remaining support marks carefully with flush cutters or a craft knife, always cutting away from yourself.

2. 02

   Plan the assembly

   Keep detailed or difficult-to-reach parts separate while you do the first sanding. For long props, use the internal rod or dowel size specified for that particular model. Never force a rod into a part that was not designed for one.

3. 03

   Sand the visible layer lines

   Start only as coarse as the print needs—usually around 80–120 grit for heavy seams—then move through 180 or 240 and finish around 400 grit. A sanding block helps keep flat blade faces flat. Stop before sharp details become rounded.

4. 04

   Join and fill the seams

   Use an adhesive suitable for PLA and the load the item will carry. Hold parts aligned while the glue cures. Fill seams and small surface defects with a compatible modelling filler, let it cure fully, then sand it level with the print.

5. 05

   Apply filler primer

   Remove all dust and apply several light coats of filler primer rather than one heavy coat. Let it dry for the time stated on the can. Primer reveals low spots and remaining print lines so you can correct them before colour.

6. 06

   Wet-sand and inspect

   Once the primer is fully cured, wet-sand with approximately 400–600 grit where the filler and paint manufacturer allows it. Dry the piece completely and inspect it under side lighting. Repeat filler primer and sanding where needed.

7. 07

   Paint in thin layers

   Use a base coat compatible with your primer, then build colour with thin coats. Mask only after the previous colour has cured. Acrylic brush paints work well for detail; suitable spray paints are useful for larger even areas.

8. 08

   Protect the finish

   After every paint layer has cured, apply a compatible clear coat in the sheen you want. Leave the finished piece to cure before handling, wearing or packing it. Display pieces are not toys unless the listing specifically says otherwise.

Technique reference: the Australian cosplay makers at Illustris Models’ FDM finishing guide. PrintVault’s wording and safety guidance are original.