Bunnings only sell CD ply - the D side can be pretty rough - although I have seen CD ply at Mr Ply (specialist ply/timber place) - looked just as bad as Bunnings - but was priced about 50% more.
Apparently the only difference between marine ply and exterior grade ply is the marine ply must have A grade plys all through the laminate - ie no filler or voids. Both use the same A-bond glue.
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