LRB (Liquid Rubber Base) is a self-leveling liquid rubber that will cure throughout its entire volume at any thickness in one or multiple applications. TAV (Thickening Activator) is mixed with the LRB at a 2:1 ratio (2 parts LRB to 1 part TAV) to create a thickened mixture similar in viscosity as silicone caulk. LRB/TAV mixture is used to patch and profile joints, seams, cracks, holes and rough areas whether horizontal, vertical or inverted. Note: TAV only works to thicken & activate LRB (Liquid Rubber Base) and has no function outside of the Sani-Tred system.