I have a
Columbia 10.7 and it had major leakage on the chainplates. The rear stays were pulling up through the
deck because the
water soaked
core was starting to disintegrate. I cut open the
deck, removed all the rotten
wood and rebuilt with new
wood and about 10 layers of
fiberglass.
You say you don't have any wood
core, but you still need some sort of support for the
mast. Mine goes down to the
keel. So, you may need to improvise a
compression post or divert the vertical load to a bulkhead somehow.
The
repair you did, as noted, is not correct. The
fiberglass will pull away from the
gelcoat (probably with it) over time. I've done tons of
repairs on my
boat now and even when you grind down to the bare glass
Epoxy can still fail. I had 4 furring strips pop off after gluing them to the overhead due to flexing and an incomplete bond.
After talking with West System, they advised grinding or
sanding down to bare glass until you take all the shiny
parts off. Then, wet the surface down with unthickened
epoxy before laying any glass. Good luck