Ultra Iso/Npg White Ext. Gelcoat GL Kit w/2 oz. MEKP Highest quality gel coat suited for yachts, swimming pools, sanitary ware, sinks, commercial and recreational vehicles and many more uses ISO/NPG Base offers 60% less shrinkage, Low-VOC with less overspray, and up to 200% better gloss retention than conventional gel coats Colorful finishes which resist moisture, chemicals, impact and UV light The primary purpose of exterior gel coat is contact molding (spraying on a mold); when used for repairs, the addition of sanding aid or patch booster is recommended to produce a tack free surface on air the exposed side. 8 to 12 minute gel time at 1.5% MEKP @ 77F