3M 21531 Polyurethane Foam - Clear Paste 5 fl oz Tube Liquid, solvent-based sealer protects exposed edges of slip-resistant tapes and treads from excessive moisture or liquids. Convenient tube applicator seals approximately 75 to 100 linear feet (2) 3m 21531 5oz Polyurethane Foam Clean Paste Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.