I apologize if this question is answered somewhere else in the forum, but I have looked and haven’t found anything. I plan on sandblasting my inner fenders of my s-15 and applying bedliner to them. What kind of preparation do I need to do after sandblasting them? Also, is it OK to use the Extreme Chassis Black and its primer on the radiator support, as well as a few other places under the hood? Thanks so much!