SEAL ThermaShield Luster 3 mil 38 in x 500 ft 62421. SEAL ThermaShield is a family of economical, high-activation temperatures (185- 235°F) laminating films designed to protect and enhance images in a variety of display applications. Ideal for use on any SEAL multi-temperature roller laminator. It can be used as an overlaminate on mounted graphics or as a top or bottom layer in encapsulating applications. The gloss finish offers a crisp, high-polished finish that sharpens colors and creates a brilliant visual impact. Provides a semi-reflective, sparkling finish which enhances image contrast and reduces glare from direct light.