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  Gelcoat cracks below waterline only?

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Author Topic:   Gelcoat cracks below waterline only?
1967 Sakonnet posted 08-12-2002 10:26 AM ET (US)   Profile for 1967 Sakonnet   Send Email to 1967 Sakonnet  
I have been grinding paint off the hull of my Sakonnet and have discovered many small gelcoat cracks below the waterline only. Has anyone found this same situation on their boat? I'm not sure if the cracks were caused by the water or possibly a paint layer that was applied to the bottom of the boat only. By the way, I am grinding the cracks out down to the fiberglass and filling with West Systems epoxy.
JFM posted 08-12-2002 12:56 PM ET (US)     Profile for JFM  Send Email to JFM     
1967,
I had the same problem.

I spoke to an engineer at West Sytems and this is what he told me.

Use a DA with 60-80 grit paper on the old bottom paint scoring the old gel. Open blisters and cracks, but if the old gel stays on it's OK. Mark the water line and put a coat of epoxy over the entire bottom. After that drys, scotch brite the blush. Fill in any voids or blisters with epoxy and 407 fairing compound, let cure. Sand the patches of 407. Scotch the blush and put 2-6 coats of barrier mixed 422 epoxy on, apply each coat when tacky. Let cure, remove blush wet sand with 100-200 paper, then bottom paint.

Simple as that. I just did it and it's a job from HELL!

Regards, Jay

P.S. If you need any West Systems products let me know, I'll sell them cheap. It's a job I'll never do again!

Taylor posted 08-12-2002 03:16 PM ET (US)     Profile for Taylor  Send Email to Taylor     
How long did *that* take, Jay?
JFM posted 08-12-2002 08:42 PM ET (US)     Profile for JFM  Send Email to JFM     
Taylor,

I worked on it for a week on and off (11 days now but who's counting:).

I hung the boat at one of my father-in-laws garages (machine shop) and worked on it on a creeper and my back. I should have taken the motor off and the center console out and flipped it. But this garage is air-conditioned, but the SOB was broken.

I haven't completed the bottom paint yet.

I've prepped the above water line hull and will spray Imron in the next day or two (waiting for the humidity to go down). After that I'm using Woolsey Super Premium bottom paint.

In between waiting for West Systems to dry, I've rebuilt the trailer.

The old Johnson 100 runs like new, so I plan a quick fishing trip to Fla. when my son gets home from Alaska this weekend.

I'll do the wood in the fall and maybe a new motor too.

After all this work, I'm having second thoughts about selling my 2000 Momtauk.

Regards, Jay Regards, Jay Regards, Jay. All work and no play make Jay a dull boy!

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