[123Gone]

I've never used POR-15 products but it's my understanding that they are VERY good.

Well, I think the closest POR-15 product to a bedliner would be BlackCoat. If you use this, I think you are going to run into some problems:
1. How are you going to apply a non-slip final texture?
2. BlackCoat cost about $165 per gallon. BlackCoat is almost 30% solvents (that evaporate away) which means that per every gallon, you only end up with about 3/4 of a gallon of actual solids. When we apply a bedliner, we spray in about 4 to 4.5 gallons of solvent free solids which ends up as a thickness of about 3/16" on the bed and about 1/8" on the sides. To get the same thickness out of BlackCoat, you would have to buy about 5 or 6 gallons of BlackCoat which would cost you $825 to $990.
3. In order to apply BlackCoat, you will also need to prep the bed. You will need, paper, tape, acetone, gloves, brushes/roller, POR-15 solvent (for thinning and clean up), and probably a day or two of your time.