Has anyone here used Seam Grip? I am making a few stuff sacks and want to waterproof the seams.

Also, I recently bought a Mamajamba with pull outs. I have not had it out yet. Are the seams and pull outs sealed on Warbonnet Guys tarps like they are on the OES tarps? If not I will want to seal them up as well. I will probably just use Seam Grip unless anyone has a better suggestion.

The seam sealer on my OES is shiny and a little tacky. Which makes me think it is Seam Grip because that is how it looks and feels.