3M™ 3635-91 2 Mil Day/Night Film is a specialized translucent cast vinyl designed for internally illuminated signage that changes appearance between day and night. During daylight, the film appears smoke gray or dark in incident light, and when backlit at night, it transmits the light source color (typically white) for high visibility in illuminated signs. This film is part of 3M’s Day/Night Light Management Films and is ideal for use on backlit channel letters, sign faces, and displays where you want one graphic look in ambient light and another when illuminated. It features a matte, translucent finish with approximately 47% light transmission and offers long-term outdoor performance when applied correctly.
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