Loctite PL Window Door & Siding Polyurethane Sealant is a premium quality, professional grade sealant developed especially for forming permanent, water and weatherproof seals in most exterior gaps and joints for windows, doors and siding. With just a one-time application, this elastic sealant remains flexible to expand and contract with construction material movement ± 25% to protect and retain the original seal while also providing corrosion resistance. This sealant exhibits outstanding durability and tear resistance and can withstand harsh exterior environments and deterioration from weather, stress or movement. It is also UV and ozone resistant and does not soften in the sun. Loctite PL Window Door & Siding Sealant is a low VOC formula that meets strict federal and state guidelines and is CARB (California Air Resources Board) compliant.