| abstract |
A water-proofing/sound-proofing coating composition comprises, in order, from a surface to be coated (A) an adhesion promoter, (B) a seal coat comprising (1) a polyurethane (2) a heat absorber, (3) a nonvolatile extender, (4) a volatile solvent, and (5) an inert filler, and (C) 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. A process is also provided for preparing a cast-in-place surfacing composition comprising (A) applying a primer to a surface to be coated, (B) applying a seal-forming coat to a primed surface, (C) allowing the seal-forming coat to stand for a time sufficient to allow entrained gases to escape from the seal-forming coat and the primed surface, and (D) applying to the surface of the sealforming coat a membrane-forming coat comprising (1) a mixture of a high molecular weight polyol and a low molecular weight chain stiffener, (2) a substantially inert nonvolatile extender, (3) a polyisocyanate, (4) a volatile solvent, and (5) a polyurethaneforming reaction catalyst. |