I am willing to bet that the block of wood that was used as a backing block is rotting and the rotting wood has allowed the thru-hull to break its seal against the hull and that is the source of the weeping.
Yes, you'll have to haul the boat to replace the seacock and through-hull.
Yes, you'll probably be able to wait until Tuesday.
Not a whole lot that you can do to stem the water flowing in that won't cause a huge problem later, when you're trying to replace the through-hull and seacock.
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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.