"Other brands are available, Rhino Liner being another popular brand of sprayed-in bedliner"
I have Rhino in my pickup - 9 years of wear and tear with only a chip out of it here and there. I do mean wear and tear, too - I don't hesitate to use a pickup as the truck it was intended to be and have hauled more lumber, rock, and miscellaneous stuff than I care to remember. /forums/images/graemlins/tongue.gif
Good idea to use a drop-in on top of the spray-in liner, though. I've acquired a few dents from stuff sliding. I gave away my drop-in when I got the spray-in out of frustration with its wearing down the paint and noise (they vibrate). Maybe I should have kept it.