Plastic Preparation Steps
Plastic parts are among the most common of paint failures in the industry. Due to the manufacturing process & combined with the surface tension of plastic, adhesion can be difficult in many instances. Here are some tips to getting your paint to stick:
Clean, Clean & Clean Some More
Plastic depends highly on chemical adhesion which also depends on you successfully removing the contaminants that remain on the plastic. Mold release agents are the most stubborn. Clean your plastics with soap & water & a good plastic cleaner.
A good sanding paste will also help you achieve a new level of cleanliness. Use them in conjunction with a grey scuff pad. I’ve heard of some using comet or ajax powdered cleaner in place of them. I wouldn’t advise it, but never using it I don’t know exactly what I’m missing.
Remove bad primers
Run adhesion & solvent test on your plastics that come pre-primed, Don’t just sand and paint! When you paint over garbage, your paint becomes garbage too!
Check your manufacturer’s directions
Any reputable paint manufacturer will provide clear instructions for painting plastic parts, follow them! They are key steps in achieving the results you are after.
Establishing good practices for plastic refinishing will prevent common failures such as peeling & excessive stone chipping.