DAP /Bondex bonding liquid and floor leveler additive is a versatile product that can be used as a glue to bond new concrete to old and as an additive to increase adhesion and flexibility in plaster, mortar, concrete, floor leveler, stucco, and waterproof cement paint. For use indoors or outdoors. DAP Concrete Floor Leveler must be mixed with DAP Bonding Liquid & Floor Leveler Additive.