If you use the spray-on type, remember that there is a drain hole at the front of the bed on each side.
Just another option - but I bought a bedliner insert. Before putting in in, I caulked the seams and applied RustOleum (sp?) rusty metal primer. Then undercoated with GM undercoating.
I know that the liner inserts can trap moisture, but when I removed it to do the truck again after 8 years, there was no rust.
My wife bought the liner for me as a birthday gift.
When I went to pick it up, the guys at the store said they had to order one that was made for a Dodge. Not sure what year, so I'm not much help.
I really like it. Have hauled lots of firewood in it. No problem.
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