Safe for all roof surfaces. MicroSealant putty tape can be used as a 100% waterproofing gasket. Fuses at a molecular level to virtually any surface except silicon. Stays flexible at extreme temperatures for perfect, easy sealing of roof vents, skylights, antennas and other roof accessories and protrusions. Can be twisted into a rope and used as a caulk to fill gaps and voids. 2" x 48" roll. 12 rolls /box.