| Some good points by BeamieDry fit as many time as necessary before installing with either 4200 or 5200.   That stuff can make a mess.
 Be sure to remove all bottom paint, sand, wash with acetone areas to be sealed, inside & out.
 Should you be removing an old thru hull & need to drill bigger hole (think mine was 2inch)  hot glue a scrap piece of wood inside to have a pilot hole for correct bigger hole saw size. Hot glued wood will pop off easy enough later.
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