| 摘要 |
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.
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