Grind a recess in the hull around the hole to be plugged on both the inside
and outside of the hull. Using epoxy (not polyester) resin, place a layer of
glass cloth around the outside or inside. Fill the hole itself with
resin-saturated glass fibers. Place another layer of glass cloth on top of
the patch. If needed, apply more layers of glass. Finish the outside with a
slurry of epoxy and glass spheres or other filler of your choice. Sand it
smooth, barrier cote, and paint. Oh, do this when the outside temperature is
above 50 degrees.

BS
"Roger Long" wrote in message
...
Can anyone point me to some good on-line info on plugging old through hull
holes in a fiberglass hull?

Any other advice appreciated. The yard wants 6% of what I paid for the
boat just to plug one and put a new backing block in another. I hate
working with glass but it looks like I'll be doing this myself.

--

Roger Long