How do I cover gaps and cracks? Liquid Rubber Seam Tape is used to bridge gaps, cracks, seams, vents, protrusions….. Related articles Will sun have an effect on the Liquid Rubber Waterproof Sealant? Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? What if I don't want black as my final color? How should I prepare the surface before applying Waterproof Sealant? The black surface turns brown when wet? Comments 0 comments Please sign in to leave a comment.