Abstract: Disclosed is concrete surface coated with a cast in place surfacing composition comprising at least three layers, in order from the concrete surface:a first layer comprising: (1) a hard, epoxy resin, and (2) an inert, inorganic filler material consisting essentially of hollow ceramic beads;a second layer comprising a bonding agent which improves adhesion between said first and third layers, and;a third layer comprising: (1) 20 to 80 parts by weight of a polyurethane, said polyurethane formed by reacting a polyisocyanate with a polyurethane precursor at a mole ratio of 0.8 to 1.4:1, said polyurethane precursor comprising 15 to 60 parts by weight of a high molecular weight polyol and 2 to 10 parts by weight of a low molecular weight chain stiffener, (2) 20 to 80 parts by weight of a substantially non-volatile extender, and (3) 0 to 20 parts by weight of a volatile solvent.

Abstract: A patch for the underwater patching of a urethane-based coating membrane is provided. The patch comprises a section of nonwoven, fabric-reinforced urethane-based membrane coated with a composition comprising a polyurethane; non-volatile extender; a volatile solvent; and a water-insoluble, heavier-than-water, inert filler material dense enough to make the composition denser than water. Methods for effecting the patching or repair using the patch are also provided.

Abstract: Polyurethane-forming compositions comprise (a) a polyurethane precursor, (b) a substantially inert, non-volatile extender, (c) a thixotropic agent formed by reacting a long chain primary or secondary monoamine and a polyisocyanate at a NCO/amine ratio of 0.1-1.05:1 and optionally (d) one or more inert fillers.

Abstract: A water-proofing/sound-proofing coating composition comprises, in order, from a surface to be coated (A) a prime coat comprising (1) a paint binder, (2) a heat absorber, comprising a dark, preferably black, pigment, (3) a volatile solvent, and optionally (4) an inert fller, and (B) a membrane coat comprising (1) a polyurethane formed from (a) a mixture of high molecular weight polyols and low molecular weight chain stiffeners and (b) a polyisocyanate, (2) a nonvolatile extender and (3) a volatile solvent. The surfacing composition can also include an overlay of a wearing surface such as an asphalt concrete.