If you 're installing windows, or skylights and you 're not using with child STUFF Window & Door foam sealant, you 're probably unwitting of a faster, cheaper air-sealing solution. In fact, there some window and door manufacturers that have tested and endorsed with child STUFF Window & Door. It is a minimal-expanding foam with a let out pressure build that a undestroyable, gas-tight and water-repellent seal between a window or door frame and its roughly opening without bowing or bending the window frames. It 's the model and door draft stopper.