Hydroflex® super hi build is a ready to spray waterborne acrylic urethane primer surfacer designed for professional refinishing of both thermoset and thermoplastic substrates. this product has superior fill and build properties and provides outstanding adhesion and topcoat holdout. specifically designed for use by the bumper recycler industry, this low odor, easy-to-apply formula can be top coated with most basecoat/clear coat products (water and solvent) and single stage (enamels, urethane and polyurethane). follow paint company topcoat recommendations when using this product. hydroflex super high build covers in 1 to 3 coats, sands easily wet or dry in 1 to 2 hr without feather-edge tearing.