If you 're installing windows, or skylights and you 're not using eager STUFF Window & Door foam sealant, you 're probably insensible of a faster, cheaper air-sealing solution. It is a minimal-expanding foam with a first pressure build that a indestructible, air-tight and water-repellent seal between a window or door frame and its jagged opening without bowing or bending the window frames. It 's the unconventional and door draft stopper.