The original chemical concrete bonding agent incorporates polyvinyl acetate homopolymer in a patented formulation. Designed for exterior and interior use, Weld-Crete® will bond new concrete, Portland cement plaster, and cementitious mixes to structurally sound concrete floors, walls, columns, beams, steps and ramps. Weld-Crete® can be "painted on" in a single application 1 to 10 days prior to concrete placement.