This product, like all 3M products, is excellent. I used it to reseal the leaky joint between wheelhouse and deck. The previous seal/gasket has dried out, shriveled and cracked. I cut it out and filled the grout 4000. I cleaned the area with acetone, masked the grout and applied 4000 with a caulking gun. The sealant spread smoothly and completely filled the seam, easily sealing the leaking seam. This product is waterproof, so cleaning will be messy if you get it where you don't need it. It isโฆ