On my first build(Endeavor), I used a light grey automotive primer in a spray can. When I sprayed on the paint it worked pretty well. Now, working on my Fair American, I used the same primer. Then I began painting the model with acrylics. They sure look good, but dang it, the tape will sometimes peel the paint right off. I am guessing that it is just sitting on top of the primer. What is the most effective combination of primer and paint types to use together?