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FGCI General Purpose Polyester Resin is an unsaturated polyester laminating resin sold as a gallon kit with catalyst, meant for hand lay-up and spray-up fiberglass work. Its selling point is a long open time: it stays tacky longer than most polyester systems, so you can lay several layers without mixing fresh batches. It wets out mat and cloth quickly and resists sagging on vertical surfaces. It is a workhorse resin for boat repair, panels, tanks and automotive parts, not a structural epoxy, so it is weaker and more brittle than epoxy and shrinks as it cures. Choose it for cost-effective general laminating; choose epoxy or vinylester where strength, waterproofing or adhesion matter most.
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Lowest price we've seen: $126.99 on Nov 10 at West Marine. Tracked across 1 store since Nov 10.
Owners and laminators generally find it easy to work with, praising the long open time and fast wet-out for multi-layer jobs. Complaints center on the styrene odor, batch-to-batch consistency and the brittleness of thin cured parts.
FGCI General Purpose Polyester Resin is a polyester resin sold as a gallon kit. It is made for everyday projects and for repairs and construction.
The resin suits hand lay-up and spray-up processes. It wets out fast, which saves time when laminating, and it resists sagging. It stays tacky longer than other polyester systems, which gives more time to apply follow-up layers.
It is used for boat building, marine parts, panels, tanks, automotive parts and other general-purpose fiberglass-reinforced parts.