1. Dibutyl Tin Dilaurate Add 2.5 fluid ounces of a 20% dibutyl tin dilaurate solution in xylol to one gallon of moisture curing polyurethane at full body (41-43% total solids.) The catalyst must be thoroughly incorporated just prior to application. This catalyst will accelerate the rate of cross-linking induced by atmospheric moisture. The possibility of after-yellowing caused by catalyst addition is minimized when dibutyl tin dilaurate is used. 2. Amines ("Quadrol") Add 14 fluid ounces of a 35% "Quadrol" (or equivalent) solution in xylol to one gallon of moisture curing polyurethane at full body (41-43% total solids). The catalyst must be thoroughly incorporated just prior to application. This type of catalyst accelerates the cure of the moisture curing polyurethane by two mechanisms: first, the amine accelerates the moisture-NCO reaction, and secondly it supplies a portion of hydroxyls which react with the NCO excess of the urethane. Generally the amine catalyst gives a faster cure than
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