Are you thinking of the rustoleum rubberized undercoating? The rustoleum truck bed lining WJCO mentioned is not rubber. I have used it on my rear bumper and it actually worked very well and set up hard as a rock. I have had many people ask where I got my bumper powder coated. It is definitely an option that is cheaper than powder coating, but in order to get a great finish a ton of prep work needs to be done. Sanding, mineral spirits to clean it, several coats of self etching primer, and several coats of the actual bed liner. Not to mention brain cells if you don't have a respirator.
That being said, while it is great for bumpers I highly doubt I would use it on an actual truck bed. I don't think it would hold up as well if you were tossing tools etc in there all the time.
Just my .02 cents.
Who was that guy rattle canning his sliders on the trail? LOL
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