I've used Raptor on the inside of my K5 cab, inside of front fenders, and in the bed of my old tundra. I would suggest other options, as it looks really good when it's fresh, but it's not nearly as durable as something like Line-X. I will be re-coating the cab of my K5 with Line-X in the near future - Raptor may look good for a while, but if you're going to go to the trouble of doing it, it's worth it to use something that's going to last for a few extra bucks. On a positive note, I can say that it is very easy to make it look good with what's provided in the kit. It's some nasty ****, so make sure to use a good respirator when spraying it if you decide to go that route.