[84 400]

I found with POR that u need a good well etched base for it to stick well. If it does not stick good it will flake off. a lower grit snad paper will leave nice gouges for it to bond to. something like 80 or 100 grit works well and sanding in between coats with 150 also helps. Also the metal prep product they make called marine clean works well to inhibit a good bond.

Alot of guys in the jeep world swear by herculiner on floor boards. It works good If you mud it a lot. and in the interor it will not get damaged by UV rays. However it is kind of thick so if your carpeting over it I would just go with POR 15.