Perforated release film is .001 inches thick x 15 inches wide. Polyolefin release film is compatible with epoxy systems. The perforations allow excess resin to squeeze out of part and into breather. Use this film in vacuum presses that have a permeable (i.e. carbon or cotton) topsheet. Use as a release layer between the topsheet and breather/bleeder layer. For boards and skis with plastic topsheet consider using the non-perforated release instead, since excess epoxy will not make it through topsheet. The perforated release is ideal for room temperature curing epoxies, or heated presses up to 275°F.