3M™ Blockout Film 3635-20B, White Matte, 48 in x 50 yd, 1 Roll/Case

This film blocks light transmission when applied to internally illuminated signs and enhances a neon type effect when used on the second surface of clear acrylic. 3635 20b is white on the face side and black on the back side. 3635 22b is black on the face side and white on the back side.