Dupoxy Prime SFD: used for EPOXY FLOORING is the Epoxy Primer for concrete surface is a 100 % solids, low viscosity, epoxy for use in restoring concrete floors and concrete surfaces prior to application of new toppings or as a "stand alone" sealer. THIS PRIMER ensures strong adhesion between an epoxy topcoat and the substrate. It may also be used to bond new concrete to old concrete. It has good penetrating properties in concrete. Improves the adhesion of epoxy floor toppings coatings and epoxy mortars with substrate.