If it's not too late, i'd discourage using baltic birch ply anywhere near a
boat. For all its other nice properties, it's very intolerant of moisture.
It's a toss-up whether it'll delaminate before or after it rots.

Ytter wrote:

Hi Everybody!
1 and 3/4" planks of mahogany glued on the 1/2" Baltic birch ply for the
removable sole,3-4 panels-What is the most efficient,not slippery and
esthetic way to finish it and be satisfied?
Thanks to everyone for an advice.
Ytter