3M™ Ultra Conformable Flashing Tape 3015UC is a tough commercial flashing tape designed to work with both permeable and non-permeable wall systems. This tape is extremely flexible, stretching in both horizontal and vertical directions, and can stretch to conform around corners. This tape does not require a primer. Extremely Flexible and Tough 3M™ Ultra Conformable Flashing Tape 3015UC is an extremely flexible commercial flashing tape designed to stretch in both horizontal and vertical directions and conform around corners. This tough flashing tape can be used in demanding applications with both permeable and non-permeable wall systems. This tape does not require a primer.