OK---replacing a small block w/ a big block in my 02 25' outlaw----I have to move out wider the exhaust holes in the transom---I have successfully filled in the two holes with marine plywood and fiberglass gel----inside boat side is sanded and painted and looks great----My buddy, an old fiberglass body man did the final finish coat /outside layer of the holes with the fiberglass ------he has never worked on boats or with gelcoat----He wants to finish the last layer with "red lead" and sandable primer and then we will try the gel coat--------but all the lessons I have read online about gelcoat, no-one seems to finish the final fiberglass coat this way before gelcoat !!!!!!!???!!!
Any comments or advice will be appreciated.....!!!!! Mike------Tampa Bay....