Do also keep in mind, POR15 or any of those rust converters, are just that, they are rust converters, so if you don't have rust, they don't work like they are intended to and its just very expensive paint if you don't have rust. So if you are thinking you'd paint new panels with POR15 to make them rust proof, NOPE, not gonna happen. You just used expensive paint on your new panels. I only bring that up, cuz I have heard of people using POR15 as an undercoat on a rust free body. Sure it added a layer of paint, but didn't do the job they think it did. I'd rattle can undercoat on new panels. The parts that aren't exposed, before I tack welded or screwed them in place.