TotalBoat Gelcoat Premium isophthalic NPG polyester gelcoat is more durable than standard orthophthalic gelcoat for a variety of boat building and gelcoat surface repair projects. Formulated for beautiful results with spray-up and hand layup techniques. Non-sagging, high-viscosity formula has an easily controlled setup time, is easy to apply, and has great coverage. Cured gelcoat sands easily and polishes to a durable, high-gloss finish. Compatible with gelcoat coloring agents made specifically for polyester resin or gelcoat. Available in White & Neutral, with or without wax. White gelcoat is available in Quart and Gallon sizes; NEUTRAL GELCOAT COMES IN QUART SIZE ONLY. Includes MEKP catalyst. &#034;I was able to accomplish my repairs in short order by following instructions furnished. Pretty straight forward--be safe, mix properly, apply, let cure and sand down. I adjusted hardener for hot temps and second coated deep repairs. Looks just fine!!&#034; <span class="a-text-italic">- hello via Amazon Reviews</span> &#034;Used this on an old Sunfish. Did wonders at fixing up the fiberglass. Very easy to use.&#034;<span class="a-text-italic"> - S. Simon via Amazon Reviews</span> Tinting TotalBoat White Gelcoat (with wax or without wax) creates lighter, pastel colors. Add up to 1% polyester resin or gelcoat colorants. Tinting TotalBoat Neutral Gelcoat (with or without wax) creates bold or darker colors. Add up to 10% polyester resin or gelcoat colorants (up to 12% for red, yellow, purple, orange, and light green).