I hadnt seen a post on this before so I figured I would share. There was a small article in Four Wheeler that had a guy using (non fibered) aluminum roof coating to protect his frame and underside of his new bed. This stuff can even be applied to greasy metal since its petroleum based, and will still work good. The best part; the cost. $25 for a 5 gallon pail at the local Home Depot. That is just 1/8th the cost per gallon that the bedliner from walmart costs. $40 per gallon for the walmart bedliner. I have used the wal mart bedliner before and did like it for the price. The aluminum roof coating takes overnight to dry and is almost impossible to get off. That's what we are looking for isn;t it? Something cheap, effective and permanent?