Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? Yes, you're correct. You'll want to bridge any joints, seams with Liquid Rubber Seam Tape. Then build your coats up with the Black Liquid Rubber Waterproof Sealant. Related articles How long does Liquid Rubber Waterproof Sealant take to cure? Does the product have a detrimental impact to fish or aquatic plants? Can Waterproof Sealant be applied to Styrofoam? How should I prepare the surface before applying Waterproof Sealant? Can Waterproof Sealant be put on tarred surfaces? Comments 0 comments Article is closed for comments.