Thanks for the reply. Pretty much what the guy at the place that sells shells and liners said. He said to save my money since the bed is ribbed it will dry out but put a rubber mat which i did already. He said if i really sweat the bed rusting to have it sprayed. thanks again. Truck is 2002 with 26K miles and before the camper was garaged all the time. Looks like a new truck and want to keep it that way till california bans diesels.