What is Liquid Rubber Seam Tape used for? Liquid Rubber Seam Tape is used for sealing gaps, cracks, joints, tears, flashings, skylights, gutters.... Related articles Is this product good for adhering to wood. I'm looking to waterproof a 1/2 whiskey barrel for ponding ? How long does Liquid Rubber Waterproof Sealant take to cure? Comments 0 comments Article is closed for comments.