Yes, I just did my bumpers, plus my BudBuilt crossmember and skidplate. I had everything sand blasted first, which is what they recommend. The stuff REALLY sticks to freshly sandblasted metal, you can tell. It dries very hard too. I wiped everything down with acetone just before painting. It's not easy to work with, a few observations:
* Don't even THINK about working out of the can. It gradually gets thicker and thicker as you use it. You need to pour some out of the can into another container and work out of that. I like to use these nifty 8oz containers we get at the grocery store with chicken and ham salad in them, just be sure to get it REALLY clean (I run them through the dishwasher). It reacts with water moisture in the air. Don't pour any leftover back into the can. Let the container sit out and in a few hours it will be rock hard.
* Put the cap back on the can ASAP, but be sure to clean the lip of the can off well, then put plastic bags between the lid and the can. The instructions talk about pouring a little bit of MEK on top of the paint still in the can as a "float" to keep air from getting to it, then keep it upright.
* Wear gloves, and old clothes. I wore an old long sleeve T-shirt and taped it to my arms before putting gloves on. The can warns about not letting this stuff dry on your skin, there is NO WAY to get it off, you have to wear it off. I used it 2 weeks ago and I still have spots on my legs from a few drips that seeped through the cloth.
* Try to get a durable NYLON disposable brush. The cheap chip brushes start to fall apart as the stuff gets thick, and leave bristles behind, it's annoying.
* The instructions say it can't be rolled, but that's not true. I found some really dense 4" foam rollers, and used that for the second coat. Much smoother finish, but you have to work fast and don't go over it often or it will start to pull the roller apart.