How do I cover gaps and cracks? Liquid Rubber Seam Tape is used to bridge gaps, cracks, seams, vents, protrusions….. Related articles What if I don't want black as my final color? What is Liquid Rubber Seam Tape used for? Will sun have an effect on the Liquid Rubber Waterproof Sealant? Use in Concrete Cistern for Bathing? The black surface turns brown when wet? Comments 0 comments Please sign in to leave a comment.