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"it is very time consuming.... mostly because it takes forever for fiberglass resin to dry. "
Fiberglass resin does not dry, it sets. If it is setting slowly, it is usually due to bad measuring, inadequate mixing, or unwaxed ester resin in contact with air. With the esters, the percentage of catalyst should be adjusted according to ambient temperature, but the minimum time to sandpaper-stage is under a half hour.
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