Thanks for all the feedback on this. Just for clarification, the parts that I am priming are the fenders. Like I said, I put the dupli-color on and it went on THICK. Just for kicks, I sanded some down just to see how it did. It sands easily and is supposed to be compatible with most paint systems. (Of course, that may be true, but they might also just be saying that to get you too buy.) Either way, the parts look good and there is no rust, and I can't believe any will form as thick as this stuff is on there. The parts will be both indoors and outdoors for a while, so there isn't much I can do about the environment. Just have to deal with what comes. On an ironic note, I started pounding out some dents on these fenders and am now not even sure if they are worth saving. I have already created a fiberglass patch panel for one and the rear of that same one had filler a half inch thick on it. When the filler came out, there wasn't much metal there to repair, and what was there was totally rusted out. I figure I can pony up the money for some new finders or spend countless hours and dollars to fix these. I am leaning towards replacement now.
Again, thanks for the feedback. Good advice for future needs too.
