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I just bought 4 -1 quart cans of Rust Bullet. One of the main reasons I went with RB is:
Rust Bullet
Q: 19. Will Rust Bullet® hold up to ultraviolet rays?
A: Yes. Rust Bullet® is formulated to block out the harmful rays of the sun.
POR-15
WILL THE SUN DESTROY MY POR-15 COATING IF I DON'T TOPCOAT IT?
No, your POR-15 protection will remain, but the sun will change its appearance cosmetically. That's why we recommend you topcoat it.
Zero Rust also looks like a good product, as well as Eastwood's line of rust preventative products. I bought some Eastwood to coat the frame of my '05 but haven't done it yet. I'll post how it turns out. IMO there are lots of better products out there than POR-15.
Probably if you apply it while it's still tacky. Or if it's dry then just scuff it up with some 120 grit sand paper. I know the POR-15 has a very smooth surface when it's dry, so if you don't scuff it it won't adhere.
The durability of the POR 15 that I put on the rear bumper and axles of my Burb has shocked the hell out of me. I brushed it on and it dried smooth like it was sprayed. As already mentioned the gloss finish will become dull without topcoating it.
I have used POR15 too with great success. I painted my floor before putting down the carpet, and when I restored my CJ7 I used it on the frame...good stuff.
i've been using chassis saver by magnet paints, It is mostly marketed to the haevy duty market, but worked great in the wheelwells and ojn the hitch on my sub. their gloss black stays glossy without topcoats, but can be topcoated if you desire
I like Rust bullet I did the entire bed of my blazer and it just seems to bond alot better, It's like it actually is a part of the metal. POR-15 seems a little too rubbery and flexible when it sets up. Plus rust bullet is really durable once it is on.
I am running POR-15 on my sliders and bumpers and do not like it. Where I have rubbed a tree or rock it has flaked and you can sit there and peel it off like the old lead paint. It was all ready on them when I bought them but going to strip it down and try Rust Bullet on them and see how it holds up. It is great for protecting the metal, cause its all shiny underneath but durability is lacking or atleast what is on mine is.