I used a quart of POR-15 and a quart of Chassis Black. But I think I used some for my axles too. For both quarts you are into it for less than $100 for the paint but if you buy their prep products, it would run just over $100. Considering how hard the paint came out on my frame, it was well worth the time and effort to save myself the bucks that I would've spent on powdercoating. In fact, I overpainted the area that I was going to weld in my frame brace. I tried sanding, wire brushing, paint remover, but nothing made a dent in the paint. I finally had to take a grinder to the paint to get back to bare metal for the welding. I've wacked on the paint with a hammer and it doesn't phase it. However, I did follow the instructions to the letter, including prepping it by stripping all oils off of it with their Marine Clean, and then spraying it with their Metal Ready. I'm using it on my axles, front Crane High Clearance D60 diff cover, and I may use it on my bumpers as well.