I originally painted my '31's chassis with DuPont Centari. I still have several ounces of ready to spray left of the quart. You do need to do a good prep, prime and clean first. As far as POR-15, do a search and you will find mixed emotions. Myself, don't care for the stuff. I ended up having my very nice Centari paint job blasted and then powder coated. Much more durable - and again, 'emotions' run high there as well. I'm happy with mine several years after being done as there are zero chips, dings or rusty spots.