Its a metal coating that actually bonds with the metal, once it is on a real PIA to get it off so don't get it anywhere you don't want it. There are similar products, I don't have any first hand knowledge of them. I have used POR on a full frame coating about three years ago so far winter salt hasn't touched it. There might be easier or cheaper options now that's just my .02
Even better is a product called chassis saver I use it on everything.We do lots of old jeep restoring and build rockcrawlers rust is bad this stuff works!Look up monstaliner they sell it monstaliner is also the best bed liner type product I've ever used.
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