wow you for sure do not want 4 gallons of resin in your transom way to much weight, at most 1 to 1.5 gallons. 1 1/2 oz chop mat is the heaviest you need for glass. to much weight will cause you issues later down the road. i didn't use 4 gallons on the entire 21 ft project boat i rebuilt and that's with transom and floors.
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1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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