This one-component, minimal-expanding, low pressure-build, flexible polyurethane foam is exclusively formulated to air seal the gap between a window or door frame and its rough opening. The foam expands only enough to generate an effective seal. When applied properly, GREAT STUFF PRO Window & Door is proven not to distort or bow window and door frames. It’s easy to form durable, airtight, water-resistant bonds to vinyl, wood and metal frames.