3M(TM) Weather Resistant Film Tape 838 White, 1 1/2 in x 72 yd, 24 per case Bulk 3M(TM) Weather Resistant Film Tape 838 White, 3.4 mil (0.09 mm) tape with an acrylic adhesive and Tedlar(R) PVF backing 3M(TM) Weather Resistant Film Tape 838, 3.4 mil (0.09 mm) used for sealing the seams of outdoor building panels, windows and doors as well as similar severe exposure applications, hinge seal on shower doors