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Just remember that balloons or balls are not ment to be used alone. They provide no structural strength, you need to add cabosil to them to prvevent running and of the mix and strength to it. The balloons and balls make it easier to sand.
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978
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