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 see blisters? How should I prepare the surface before applying Waterproof Sealant? Can I build my final membrane all at once? What if I don't want black as my final color? What should I use to clean up? Comments 0 comments Please sign in to leave a comment.