Frost King's reusable weather seal adhesive thermal sealant strips can be used to seal gaps around windows, doors or other air gaps. They're quick, easy and they work. Use to seal the gap between air conditioners or for other similar purposes. Smooth, white, strips are more attractive than industrial products and can be repositioned with no damage to many substrates. These reusable strips work with a variety of substrates. They are not for use on glass, but rather the materials that surround windows, such as wood and plastic.