Ok, so here's a long term test on the stuff.
I put mine on over 2 years ago, from the spray can. I originally wanted something that was a little thicker than paint, but would harden, unlike undercoating. This was the stuff. After 2 years on the outside of the body it's flaking like mad. Of course, the Scrambler has led a hard life, being broadsided by a Chevy and beat into trees so the doors didn't line up anymore. I still like it, but would chose carefully where I put it. I would use it anywhere there isn't going to be a lot of wear and tear. I coated the bottom floor pans in it and from all the wheeling mud and abrasiveness, it's worn off, resulting in rust. However, it is easy to recoat and where it's still adhered there is no rust, looks great. I also put some on the top of the bed rails (see pic, everything black is the Dupli-color, large side stripe is where it's flaking), and it's still holding fine, no flaking.
I also did the wife's custom rock rails on the TJ with the stuff, after a year's wheeling it was scraped off the bottom but the rest was still intact. I removed them last year and recoated them, which I'll probably do every year.
Here's the million $$$ question. Would I coat the frame with it? Probably, but only after coating it with Hammerite first. I plan on painting the frame with Hammerite Gray then coating it a few months later (Hammerite takes 2 months to fully cure) with the Dupli-color, so I'll be able to see where the stuff comes off on the rocks. I'll probably also recoat the worn spots at least once a year, just to play it safe. I have no idea how this stuff holds up to oil though, which is what I'm filling my frame with to stop the internal rust. It'll soak into the dirt and keep everything from rusting. Of course then you get the never ending oil drips in the driveway, but at least the frame will last a little longer. /wwwthreads_images/icons/smile.gif
Now that I really think about it though, the flaking is on the areas I put the Hammerite first, maybe it didn't adhere well to the paint. The directions say to prime first, but I may have went overboard. The floorboards weren't painted with Hammerite, and they're just scuffed off from wear, no flaking.
JEEPN
'81 CJ-8 Scrambled!
GM151/SM465/NP205 twinstick/7" Lift/33" Swampers/REP 8000/RS 9000's/IHC Scout II D44's F&R 4.10's & Lockrights