Has anyone ever used this? If so what's your opinion on it?

 

Are you planning to line your bed with it? If that's the case look at herculiner or the bed armor from duplicolor. They both hold up well and are a little tougher than the rustoleum. I have only ever used the rustoleum on bumpers and they chip very easy. I had the duplicolor on my old dodge and it held up great. I wish I would have put the UV protection on it because it did fade bad but I have read that they all do that. I'll try and dig up some pics of my old truck to show you the finish of the bed armor.