I have used both rust bullet and POR15 and have had some intresting experiences.
I was told at the local painters supply that its better to put por on a rough rusty surface than a fresh sandblased one. This seemed a little odd to me, but hey, they are painters by profession and I am not. So i did as they said, what a mistake. I too my chassis and rough sanded it, wire wheeled, etc. and cleaned with brake cleaner. It rusted within one month, sitting inside might I add.
So next time I sand blasted an entire axle housing and tried it again. It worked much better, been outside all winter and I havent seen any rust yet.
In my experiences surface prep is extremly important, I dont believe any of this paint of rust stuff that it may say on the can. Now I do have much more experience with por than rust bullet, but I think they are pretty similar...am i correct on this?
The only way I have found to get proper adhesion to metal is to take it completly apart, sandblast, clean/prep, and paint.
I blasted this pickup axle and painted, I think its acceptable, this only got hardware store rustoleum and its still looking ok. hasent seen salt yet...
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Does rust bullet claim you can paint over seasoned metal?