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If you run the hole saw in reverse until you get through the gelcoat, you'll cut the gelcoat without much chipping. Taping the area with masking tape will help too.
If the hull is cored where you install the through-hull, you'll want to remove some of the core and pot the hole with thickened epoxy before installing the through-hull.
Also, don't put through-hulls too close to each other. Doing so can weaken the hull and lead to failure. Back the through-hull with a fiberglass backing block bedded in thickened epoxy.
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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.