I've used it on other parts of the car and it's an awesome product. Just clean the surface and apply. If there's any surface-rust, scrape/sand/grind off the loose stuff first.
I have, and I used what they said to use (Marine Clean, Prep & Ready), and I've had no issues. Its been on there for 6 years, I've driven in some nasty rain storms, and it still looks as good as it did the day I did it.
I use it on everything that does not see the sun. Sunlight will make it turn gray and chalky over the years. But everything under the hood and under the car has gotten a coat of it as I work on it. It hardens to look like powdercoat, so it repels water and chemicals. We tore down a zero turn lawn mower last season, got it cleaned up, and used POR-15 on the entire deck and after a season of mowing 9 acres of yards, it is still holding on despite hitting thousands of crawfish mounds, tree branches, ant hills, etc. DO NOT apply to clean metal. If the metal is clean or if it has any oil to preserve it, clean it up, spray water on it and let it sit over night or for a few days. Brush off the new rust and THEN apply POR-15. It needs a little porosity to cling to otherwise it peels off like saran wrap first time anything rubs or hits it. Or better yet, use the recommended products like Dave did.
I have it on my floor pans, inner cowl, and engine compartment/front end. I top-coated the engine compartment and front-end with Chassis Coat. Follow the directions and use the recommended cleaner and prep. The directions also state that POR-15 can be applied directly to surfaces that have been sandblasted.
por 15 can be used to protect the " inner " sides of bumpers also . I coated several sets liberally and they're still looking good after many years . Under the dash , cowl repairs , inner firewall areas.. and many more . Cometized ( Chip )
When I rebuilt my front suspension I painted all of the parts with POR-15. 10 years or so and it's held up real well. Also painted the inside of my cowl with it.
