Sealing truck cap

Agreed that the tailgate seal around the outside should only adhere to the painted surface. I was specifically asking about the Rok Block which mounts between the bed and the tailgate. I think that would pretty much have to stick to the liner on both the truck bed and the tailgate.

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Mine stuck to the bedliner on the tailgate, and the painted bed surface. Stuck down like it was welded. I had to get a new tailgate so I removed it and re mounted and it's still holding well. The other tailgate seal works OK but you will/may need addl pieces to completely seal it.
IF there is any chance of water getting in the bed, do not seal all the seams between the bed and side walls. My truck has a slight downward angle and the water pools in the front of the bed. I had to remove some of the front caulking and it still doesn't drain very well (I use a hard folding bed cover).

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