The gaps around window and door frames give unwanted air an open invitation into a home. But with GREAT STUFFâ„˘ and GREAT STUFF PROâ„˘ Window & Door Insulating Foam Sealant, you can block the flow of air quickly and easily. Itâ€™s especially easy if youâ€™re working on a new construction site. If the doors and windows are already finished, youâ€™ll need to remove the trim. When youâ€™re done, customers will enjoy greater comfort and lower bills.