This '55 Chevy was primed with Tamiya Surface Primer, painted with Testors Model Master Custom Lacquer base/clear paint, then cleared with Testors Extreme Lacquer Wet Look Clear. The paint/primer seems very brittle and doesn't seem to have stuck to the plastic very well. While gently trying to scrape the paint from where the head light bezels will get glued in, bigger chips of paint/primer just flaked right off. Does anyone have any opinion as to why this happened? Is it a compatibility issue with Tamiya primer and Testors paint? The body was sanded with 600 grit, and washed with soap and water prior to primer.