Supercheap Auto has partnered with ColorSpec to offer the easiest paint mixing solution for all your automotive needs. To find out more click view now. ColorSpec plastic primer filler is designed for bumper bars, automotive vehicles and even for most household plastic parts. The filler is a fast drying flexible primer, which makes it easy to sand and provides excellent adhesion to most plastic surfaces for repairs and minor surface imperfections. This product can be top coated with Colorspec base coat, clear coat system and most conventional single pack colour coats, including acrylics and automotive topcoats.