3M™ 4411B Extreme Sealing Tape is a 40-mil conformable sealing tape built for conditions where standard tapes fail. Its acrylic adhesive bonds on contact to metals, plastics, painted surfaces, and other difficult substrates without primers or surface preparation in most applications, and the black finish suits low-visibility and UV-protective coverage requirements.

The tape's high-conformability construction makes it effective wherever surfaces are uneven, jointed, or contoured — including HVAC ductwork, plumbing assemblies, marine hull seams, outdoor infrastructure, and industrial maintenance and repair. Facilities management and manufacturing environments rely on it for watertight seals that hold through weathering and surface movement.

The tape carries a 13 lb. tensile strength rating and is rated for UV and moisture resistance across an operating temperature range of 40°F to 100°F. Each case contains 9 rolls of 1" x 36 yds. and ships via parcel carrier.