That link in my previous post will tell you how to do it and what to use. SEM soap followed by Plastic/Leather Prep, rinse with water until water no longer beads up. Let the parts dry and spray with Plastic Adhesion Promoter. Let that flash for no longer than 30 minutes and then top coat with Color Coat or Sure Coat. Color Coat comes in spray cans, and there are 50 different colors. The color actually gets pulled right into the plastic, and there are no runs or globs anywhere if you follow the instructions.
No one lives forever, the trick is creating something that will.