Bushwacker is right on. If you are not going to use the liner core the sides with Balsa. I have done this on a few different hulls and it made a huge difference in rigidity without adding a lot of weight. The key is to pre coat the balsa with whatever resin you want to use so you don't get a dry layup because that creates a poor bond. Then thicken the resin and apply using a notched trowel and bed the pre cut balsa to the hull sides. You can cut the balsa with a utility knife and it conforms to curved surfaces well. Cover with
fiberglass and finish with gelcoat or paint. Ill try and dig up a few pics.
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