Drill it at least 1/4" larger then back fill it with thicken resin then re drill it the correct size. This will give you a good sealed hole.
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Current SeaCraft projects:
68 27' SeaCraft Race boat
71 20' SeaCraft CC sf
73 23' SeaCraft CC sf
74 20' SeaCraft Sceptre
74 20' SeaCraft CC sf
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