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I'm sure this will work well for some toppers and trucks. Didn't work for me, my topper sits just inside of the outside of the bed rails. Had a heavy rain and while I think it stopped the rain from getting in this stuff was soaked, I took the topper off to replace it with something else and it was really wet and this was a few days later. It stuck well, don't forget to remove the paper from the top edge, and made a nice seal. Just not water resistant in my application.