Wow, Indian, I had know idea that there was that much to think about when it came down to what I thought was simple undercoating. I'll have a lot to think about if I decide to redo the undercoating on mine. So let me ask you since you've done the research, do would it be better to use a regular paint like the PPG I'm going to put on the body or something like POR-15 for the frame and floor pans? Also, since my Grand Prix is NOT a numbers matching I'm not to worried about it being totally factory correct. I just want it done right so I can be passed down.