I have a "zone 2" hole, but unfortunately I have no access to the underside.
However I do have a gallon of West epoxy and some fiberglass, so I think a
couple more layers of glass to thicken what the screws go into is in order.
Thanks.
Go to www.westsystem.com

Pick 'Projects' then 'Index', then 'Boat repair & construction' then
scroll
down to 'repairing machined holes in fiberglass' and click on the link.

Do what they say, and to thank them for providing such help, use their
products.

Jim

John wrote:

A few weeks ago I posted about fixing a seat on my sailboat that was
loose.
Today I removed all the screws and pulled the seat out.
The screws are held only by the fiberglass; I thought there would be
some
wood, but there isn't.
I plan on using bigger screws in the existing holes and adding a few new
ones.
My only real problem is what to do about one screw hole that I tried to
fix
last year, but just wound up making way too big for any screw. Can I
stick
a plastic wall anchor in it, or maybe a toggle bolt; or am I best off
just
abandoning it?