McNett's AquaSeal and Seam Grip are urethane repair adhesives and are the same except for their viscosity (thickness). The SeamGrip is thinner and can be applied with a brush (supplied with some product packaging. The thinner Seam Grip penetrates stitching better than the thicker AquaSeal. They both can be thinned with Cotol 240. These are usually used for tent/wader repair.