Went down to my local Fiberglass supply store to price out materials, asked about different cores and was shown PVC. The owner highly recommended it and says he supplies professional boat builders that use the stuff exclusively. It's way cheaper than Coosa or Divynicell. Has any one ever used or had experience with it. He also said that polyester will work fine for the transom. I've read about poly's permeability, but he said that using it with the PVC there wouldn't be a problem.
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