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how much epoxy do you need if are glassing a 9'2 long board
A 1.5 gallon kit of Marine Grade Epoxy Resin will be enough to laminate, seal coat, and install fin boxes in a longboard.
How do I tell if I need to sand after doing the sealcoat with the greenlight marine grade epoxy resin? I saw that you said if the sealcoat is done well it won't need sanding.
If you're happy with the finish you don't need to sand the sealcoat. It has been proven that a sanded or glossed finish does nothing to improve the performance of the board in the water. The sealcoat / hotcoat is meant to seal the board from water wicking through the fiberglass and into the board.
The need to sand surfboards originated in the 60's (and continues today) with poor materials and techniques leaving an "undesirable" finish which needed to be sanded to look better - to SELL in surf shops!
The Greenlight Marine Grade Epoxy system was created to produce a nearly flawless gloss finish on your surfboard or any project if applied to a clean surface, at the correct thickness (3 oz per linear foot of surfboard per side), and with the least amount of effort. Just pour the resin on the surface and distribute it evently over the boar with a clean brush and the "plow" technique. Then walk away. The less you touch the Greenlight resin, the better it looks when cured, and does not need to be sanded.
Can you use agent F with this epoxy resin?
No need for Additive F with the Greenlight Marine Grade Epoxy System. Special surfacing componds are already included in the resin for blemish free coats.