You could always use shrink wrap tape or some other sticky tape to seal off a tarp thrown over the area in question. The mast is probably the most difficult thing to seal off, since it has the sail track or groove in it and the most irregular surface, but even that could be done with some creativity.
Another possible option is to tape a small plastic bag over the area locally... and use heavy waterproof tape, like shrinkwrap tape to seal it around anything that has to penetrate the bag.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.