Thru hull scuppers ... How did ya fix em

[white hawk]

John B, thru hull penetrations can be done easily if you use a hole saw with an extra long pilot drill. Drill your pilot hole completely through transom at the thru hull location. With hole saw larger than thru hull (say for example 1-1/2" for a 1/4" hole)Drill from inside removing material up to exterior skin. Now you have a small hole outside and a big hole inside. Fill the inside hole with thickened fiberglass putty(add some glass fiber if you want)and seal with plastic wrap and pressure bandage(ply scrap)You can drywall screw the bandage to the transom temporarily. When cured, put FG patch on inside over puttied section, when that's cured you can drill your thru-hull through this plug. You now have a FG plug that will not allow water to migrate to wood.I have used this method for thu-hulls up to 4" in diameter (inboard exhaust) with no leaks and no water migration to wood. It works.