You need to use 3m spot puddy. It will fill the pinhole and be dry in 20
min. Then sand with 220 and paint.
http://products3.3m.com/catalog/us/e...er/output_html
--
Shield Finishes and Nauticoat Marine Finish Systems
www.shieldfinishes.com
"P.C. Ford" wrote in message
...
On Wed, 15 Jun 2005 06:51:14 GMT, 1088 wrote:

Still fixing my fixer-upper. I chiseled and sanded the crazing in the
gelcoat, then filled with several different things and the cracks are
covered ok but the tiny, tiny pin-holes will not fill. Many of these
looked like tiny black spots at first. Any attempt to fill them
results in some kind of gassing and the filler just ozzes back out
after a while.
Things I've tried:
marine tex
west system epoxy and 407/404/talc
automotive bondo ($13 per gallon)
white yuppie-yacht bondo
system3 epoxy and 404
real smelly blue spot putty from the auto store
I was reasonably pleased until I sanded the second coat of primer
(parker 1040) vacuumed and washed and, and, and there they are again-
sons of bitches!
I'm definately open to suggestion at this point. Thanks for your time
as always.

Maybe what you call "white yuppie-yacht bondo" should have been used
throughout. Automotive bondo _will_ absorb moisture. It may be
released when overcoated. Pinholes are the result.

I have no idea if this is what happened, but it certainly is likely.

Your "white yuppie-yacht bondo" costs about 8-9 bucks a quart. The
auto bondo cost maybe 5-6 a quart. Was it worth it to save three
dollars a quart? Didn't think so.

The most expensive ingridient in boatbuilding is labor. It's folly to
skimp on materials.