You can apply paint over Polyethylene, Polypropylene, ABS, and PET/PBT Blends with proper surface preparation and primer.

1. First wipes down the surface with a 50/50 Isopropyl Alcohol such as Denatured Alcohol to remove any contaminants prior to sanding.

2. Sand the surface with 60-80 grit sandpaper.

3. Wipe down the surface again with 50/50 Isopropyl Alcohol ( Denatured Alcohol ) to remove all sanding residue.

4. Apply 3M Tape Primer over a small section.

5. Apply a small test section of the desired Topcoat paint. Since there are so many type of paints, it is recommended to perform an adhesion test on the small area painted. Once the paint has dried perform a hatch test. Use a razor blade to cut into the paint and the primer and draw a 2-3 inch line. You should follow this at least 3 more parallel lines about 1cm apart. Then cut 4 more perpendicular line again about 1cm apart. It should like a large tic-tac-toe game. Finally, apply duct tape firmly and then pull the tape off quickly. If you have any paint or primer on the tape the adhesion is poor. If there is no paint or primer on the tape then it is safe to apply the primer and paint over the entire surface.

This application and test can be used for topside paints and bottom paints.