since our challenge car has a life after the challenge (cprepared), we want to prevent it from rusting more (or again).
to this end, were doing the majority of rust repair that is through the sheetmetal. we are also planning to seam weld, sandblast, paint, etc the whole damn thing.
its a unibody aMC spirit that is RUSTY. not nearly as bad as the $100 bmw, but for a north Carolina car its crunchy. my 64 el camino was much more solid.
anyway, my plans are to sandblast prior to seam welding. the, prime, and paint every inch of metal I can get to. no undercoating or interior will be going back in.
as far as the inside of things like frame rails and rockers, what are my options? I have a couple of gallons of ospho and a garden sprayer, but I'm not sure if that's enough. I may be overthingking it though.
also, since it IS a challenge car, were on a tight budget. seam sealer is expensive. I thought about blasting/welding/priming, and then using a paintable caulking instead of seam sealer over all the seams prior to painting. why will this suck?