Thoro T5020 1 Gallon Thorocrete Concrete Patch A 1-component, acrylic modified, cement base patching and resurfacing material for concrete and masonry. Ready-to-use; just add water. Self-bonding, easy-to-apply, quick setting. It possesses durability, has excellent bond to clean, structurally sound concrete, good color retention and is self-curing. Used for: Resurfacing concrete floors, driveways, and sidewalks. 40 lb. will cover 40 sq. ft. 1/8" thick; 20 sq. ft. 1/4" thick, or 10 sq. ft. 1/2" thick. WARNING: This product can expose you to chemicals including SILICA CRYSTALLINE (AIRBORNE PARTICLES OF RESPIRABLE SIZE) which is known to the State of California to cause cancer. For more information go to