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I'm no expert, but from what I've read, it's just a thicker resin like the resin brushed on the fiberglass mat....that leads me to believe you just lay a couple coats of it on and let dry.
 

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imho the gel coats basic purpose is to provide a smooth surface so it will release out of the mold.sand it with 150 grit,prime it up,and block it out.if it was a boat the gelcoat would be the color coat,a car it's painted over,has no structure benifit.
 
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