White Lightning Window & Door Silicone Ultra is a premium 100% silicone sealant that provides a weather resistant seal. It is extremely durable, UV resistant, and water ready in three hours. White Lightning Window & Door Silicone Ultra is commonly applied at: windows, doors, vinyl siding, trim, etc. It is excellent for interior/exterior application on: wood, glass, fiberglass, metal, vinyl, masonry, stucco, plaster and many plastics.