Hey guys I'm painting a dashboard I have totally stripped. It has a bit if texture to it and I wanted to use high build filler primer and wet sand to get a smooth surface before basecoat. I have a bunch of 5 star xtreme Direct to metal high build primer laying around. Can this be applied over the plastic? Obviously adhesion promoter before coating. Thanks! My concern was it says direct to metal but says it can be used over fiberglass. Doesn't mention plastic. Can it be used? Thanks!