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wrote:
Would I need to use a special kind of plywood - some "marine" grade or
something? I think that the existing floor is coated with Cetol which
is why I thought that would be the best finish to put on.

I've read that the glue in outdoor plywood is the same as used in the
marine version. The major difference is that all the 'knot hole' voids
are filled in the marine grade but not so in outdoor grade.
Since your dingy is old and will probably be replaced within 3-5 years,
I'd go with the cheaper plywood and seal it well with a good oil
primer/paint. (or Cetol if you already have some)