POR-15 is great stuff. It's tough and flexible, but expensive. I've used it on my entire suspension, differential, engine block, K-member, floor and truck pans and firewall for rust protection. The paint is best to spray on if you have a sprayer, but it brushes on O.K. with a decent brush. HOWEVER, any tools, brushes etc it touches is wasted if the paint dries. Man...do not let this stuff dry somewhere on the car you don't want it! You must wear lots of skin protection because if it dries on your skin the only way to get it off is skin removal
Really, it takes several days of scrubbing with a scrubbing block before it comes off. A hot tank could not remove it from my block! It also has lots of VOC's so you need to paint in a well ventilated area...or kill a few braincells (I've killed a few that's for sure
) It's nuclear paint