Tenon® Concrete Surface Retarder is a water-based, “Formula S’’ mixture that is applied to freshly placed concrete applications to chemically delay the setting of the mortar at the surface of the concrete. This allows the top layer of cement paste to be flushed away creating an exposed aggregate decorative finish without damaging the integrity of the concrete slab. A stream of water or scrubbing with a stiff brush is used to create the decorative texture. Surface Retarder can also be used on concrete to roughen or open the surface to improve the bonding for coatings or toppings. Available in 1 gallon bottles (BOM #121117) and 5 gallon pails (BOM #121118).