A COATING RESIN AND THE PROCESS FOR PREPARATION IT COMPRISING THE STEPS OF: (1) REACTING 30% TO 60% OF A DRYING OIL, AT LEAST 5% OF THE OIL CONTAINING CONJUGATED CONJUGATED DOUBLE BONDS, E.G., SAFFLOWER OIL, DEHYDRATED CASTOR OIL, WITH 2% TO 25% OF AN ALIPHATIC POLYHYDRIC ALCOHOL, E.G., GLYCEROL, PENTAERYTHRITOL; AND THEN (2) ADDING AND REACTING UP TO 30% BY WEIGHT OF AN ORGANIC POLYISOCYANATE, E.G., TOLUENE DIISOCYANATE, 4,4''-METHYLENE-BIS(CYCLOHEXYLISOCYANATE); AND THEN (3) ADDING AND ADDITION POLYMERIZING 15% TO 60% OF AN ETHYLENICALLY UNSATURATED MONOMER, E.G., STYRENE, VINYL TOLUENE; ALL PERCENTAGES BASED ON THE SOLID WEIGHT OF THE PRODUCT.