Sledgehamma

Does anyone have these on their JK? If so, where do you put them?

Did you have an "undercoat" done?

MeatCurtains

Not on my jeep, but I've had it on my truck bed and rocker panels. In general I'm not a fan of entire undercoats of the stuff. It can actually trap moisture causing rust. It's great on places that get rubbed a lot

iloozealot

This is correct, if surface rust or moisture is present it can be trapped underneath these coatings and you won't know the cancer is spreading until it rusts through and falls apart.

Before any kind of paint or undercoating system any issues need to be taken care of. As I am swapping out parts or fixing something I always clean the local area and visually inspect; if I spot something I remove the part, sand it down, prep it, and reapply my paint system or undercoating. I also keep a list when I'm doing routine maintenance/cleaning on the underbody and as I get time I will remove pieces with issues and re-paint using the process above. Part of my cleaning process and the last step is applying fluid film or lanolin to the entire underbody and wiping off any excess.

Sometimes I get really lazy and just knock off anything loose, use dewaxer/degreaser, apply Ospho which is phosphoric acid I believe, wipe down with mineral spirits, prep, and fog in some rattle can paint.

Let me know if you have any questions.

nthinuf

Are you wanting undercoating specifically? Or are you looking at coating the bumpers, tub, hardtop, etc also?