Water will not be absorbed into the bed liner pad. the underside is made of the same material as life vests. (Check out the site) Maybe I'm fortunate, I live in Colorado and travel throughout the SW. Truck bed covered area looks like the day we bought it. Zero rust in the bed. YMMV.
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2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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