EPI-REZ WD 510 Published June 1, 2020 at 1000 × 750 in Waterborne Epoxy Resins | EPI-REZ WD 510 EPI-REZ WD 510 is a liquid, bisphenol A type epoxy resin designed for water dilution. Modifier for Portland Cement, concrete, mortars, stuccos, and grouts.EPI-REZ WD 510 is a liquid, bisphenol A type epoxy resin designed for water dilution.