High solids urethanes and application thereof

A method for applying a polyurethane coating onto a substrate by employing a catalyzed coating composition comprising the steps:

• 1. Providing a coating composition comprised of:
• A. a polyol composition comprising (1) a polymerized low molecular weight polyol selected from the group consisting of (a) polycaprolactone;
• (b) a copolymer of a compound of the formula CH.sub.2 .dbd.C(R)--R.sup.1 and allyl alcohol;
• and (c) mixtures thereof;
• (2) a saturated aliphatic polyol from 4 to 12 carbon atoms or a saturated cycloaliphatic polyol of from 5 to 8 carbon atoms per ring;
• wherein R is methyl, ethyl or hydrogen;
• R.sup.1 is a group having 6 to 12 carbon atoms containing an aromatic carbocyclic ring, and said aromatic ring is directly bonded to the moiety CH.sub.2 .dbd.C(R)--;
• B. a polyisocyanate;
• wherein the ratio of NCO/OH of A and B ranges from about 0.9 to 1.2;
• the coating composition having a range of solids content from about 40 to about 100% by weight of A and B;
• and
• C. a compatible polyurethane catalyst;
• 2. Applying the coating composition to a substrate;
• and
• 3. Heating the coated substrate at a temperature-time range of from about 130.degree. F to about 180.degree. F for a period of time ranging from about 15 minutes to about 60 minutes to achieve a Tukon hardness of at least 3 within 24 hours.