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Formwork ply is no good as it has a plastic coating on 1 side.
Marine ply is made from the same soft ply as normal plywood. The only difference is that it uses a special waterproof glue that is expensive.
The size I need is 5/8" ,16mm or even 19mm, doesnt really matter.
My David Kreige book says to steer clear of these types of plywoods and go for the hardwood plywood, like apple ply or maple/birch plywood.
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