Is epoxy absolutely necessary to waterproof a plywood boat and how thick should I make the bottom,flat part?

Is epoxy absolutely necessary to waterproof a plywood boat and how thick should I make the bottom,flat part?

I plan on building a plywood boat and will buy plans.But was wondering about the thickness of the plywood to use and can I just use regular plywood (exterior use type ) instead of marine plywood.And do I have to steam the plywood for bending into shape for the sides as the bottom will be flat?I Read the rest of this entry

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