TAMTECHseal TTSGF-5 5 gal Gloss Finish Joint Hardener For Paver Sand and Paver Sealer. TAMTECHseal is a high performance product designed to harden and consolidate sand in joints and seal the surface of pavers, bricks and concrete. This waterbased polymer will stabilize the joints, prevent wash-out of the sand and help stop weeds from growing through the joints. The product also acts as a clear sealer with a gloss finish to help protect against the weather, water, dirt, freeze thaw damage and staining. TAMTECHseal can be applied right after the installation of the pavers and has no odor, is safe to use and cleans up easily with water. The sealer is breathable, thus moisture is not trapped in the pavers. It is an exterior and interior product that can be used on new or old pavers, bricks or concrete.