I've used POR15 on many things - rear end housing - suspension A arms - Chassis.... The key to this (as with any coating) is cleaning and etching for a good grip - the paint is only as good as it's surface adhesion.
POR15 --- you can hit this stuff with a hammer and dent the metal without chipping it! LOL -- Get it on your cement floor or yourself - you'll find out how tough it is. Open the can -- use it -- try to reseal and get that can open again - NOT! Buy small cans -- use them - toss 'em. Ditto anything used to apply the stuff short of your spray gun - that would have to be cleaned.
#1 NOTE --- this stuff takes a LONG time to dry -- thus -- if you'd like your parts to look perfect - you'd better be in a dust free environment. It will have dust in it. This is not show quality paint -- it's made to paint over rust (thus the name P O R).
#2 NOTE --- Don't try to use a sponge type brush.
#3 NOTE --- Don't try to brush the stuff out... it will FLOW out plenty smooth. Remember that long drying duration? That's what has the paint flowing out flat.
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