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? How should I prepare the surface before applying Waterproof Sealant? Use in Concrete Cistern for Bathing? How does it seal? Comments 0 comments Article is closed for comments.