wax below water line?

Just spent many hours rubbing out oxidation on sun baked hulls ,and was getting ready to wax.do I wax it all? or just above the water line.
Gellcoat is some pretty tough stuff it took 3 laps around each hull to bring them back.so now I want to protect them. because outside storage in the arizona sun is my only option .any feed back would be appreciated.
Wax the entire hull. Some of the big boy racers sand their hulls before each race but wax will keep them looking good.
i have never tried it but many people like the polyglo sealer...

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bill harris
hattiesburg, mississippi
prindle 16- "BLUE RIBBON"
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