Loctite PL Concrete Non-Sag Polyurethane Sealant is a premium quality, commercial grade sealant developed especially for forming permanent, water and weatherproof seals in all exterior gaps and joints. This unique sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original seal. Loctite PL Concrete Non- Sag Polyurethane Sealant does not require a primer for concrete, brick, stone or masonry and resists deterioration from weather, stress or movement. Recommended for repairing cracks in vertical and horizontal surfaces such as concrete walls, foundations and brick and block walls, Loctite PL Concrete Non-Sag Polyurethane Sealant is a non-sag formula and bonds to concrete, brick, stucco, metal, wood, vinyl, fiberglass and many more substrates. This sealant is a low VOC formula and meets strict federal and state guidelines.