Bedliner is probably one of the most underrated do-it-alls out there. I remember that old show BattleBots (I think it was on Comedy central?), there were a couple that used bedliner as armor to defend against opponents!
If you're wondering where to get it, I know bedliner is available at Napa. They have both spray on kind, roll-on, and they used to sell a whole kit with textured roller and all that...I think it was made by either Duplicolor or 3M. Not trying to throw a plug in for them, I just used to work there for a few years
and I know its there.