This is discouraging, but helpful, as I was just preparing to paint some gray full-door panels to match my tan interior. Now that I think about it, all of my interior painting so far has been touching up existing colors, not an entirely new color over the original.
I'll still give it a shot, but if anyone has pro tips (other than not to get my hopes up), I'm eager to hear them.
@RustyAutoholicGuy or
@CreepinDeth, do you recall what adhesion promoter you used? I was planning to use SEM XXX.
Edit:
This thread looks helpful. Lots of emphasis on cleaning and prep. Also this
from SEM:
- To promote adhesion on plastics, such as ABS, PVC or other similar plastics, apply a medium wet coat of Sand Free. While still wet, apply a light coat of Color Coat. (Avoid applying the first coat of Color Coat too heavily or sagging could occur.) As Sand Free evaporates, Color Coat is drawn into the surface, resulting in excellent adhesion.
To promote adhesion on plastics, such as TPO, EPDM, PP or other similar thermoplastics, use Plastic Adhesion Promoter or XXX Adhesion Promoter. Apply one light coat, let flash for 5 minutes, and then apply one full wet coat. Allow this coat to flash 10-15 minutes, but no longer than 30 minutes before topcoating.
Tech tip: If the type of plastic is unknown, place a drop of acetone on the back of the plastic and rub it with your finger. If the plastic smears and melts, use Sand Free. If acetone does not have an effect on the plastic, use Plastic Adhesion Promoter or XXX Adhesion Promoter.
