I have a hole about 3/4" in diameter on top of the hull where the cable for my fish finder came out. I need to seal off the hole and need to know the best way to do it. I will try to get a picture of it this week.
Top of the hull...sort of on the deck like my 3/4" hole? Non critical area if its in the same place, the cable came out through a grommet with a hole in the middle, just purchase a 3/4" blind grommet and pop it into the hole, if you want to be fussy glue it in with marine goop!