I saw a 200 dollar special for paint from my local maaco and i know they dont pay much attention to details I have a 73 datsun 620 pickup and would like to paint it for the short term til maybe i can get a sweet paintjob a few years from now but until then i would like to stop the rust and have it look nice. I have a buddy who will do all the body work super nice weld in a couple small cancer spots and completely sand the whole truck and do any small bondo. do you think this prep will help? considering all they will have to do is mask and hose it?