Picked up a can and used on the drivers side, I did wire wheel before hand, but the spray appeared to attach pretty well and harden, as far as how long it last, not sure, but I've never used POR-15 berfore either,so can't really compare, but have seen truck beds that have been sprayed and taken a beating and the liner still hold up, That is these were sprayed professionlly not out a can though.
ron