These films are used to control and enhance light transmission on internally illuminated signs.
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3M™ Blockout Film 3635-20B
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. It is white on the face side; black on the back side.
3M™ Blockout Film 3635-22B
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. It is black on the face side; white on the back side.
