De-watering wet core - SailNet Community
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post #1 of 30 Old 06-11-2012 Thread Starter
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De-watering wet core

I am repairing my 34' Tiffany Jayne which seems to have quite a lot of wet core throughout. I have read up extensively on the various repair processes and decided on using a hi-vac pump to draw the water out of some sections and draw in epoxy resin/cpes. My question is where does one find one of these pumps? I figure its some sort of an adapted a/c repair pump. Anyone?
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post #2 of 30 Old 06-12-2012
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De-watering wet core

It doesn't work. I had a very high vacuum pump and tested it on wet core on a Catalina 22. It ran 24 hours then I cut it open and it hadn't dried at all. Drying is essentially evaporation and surface area has bigger effect than air pressure.

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post #3 of 30 Old 06-12-2012
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Drill the hull in the effected areas. If it stinks, you'll have to cut it out; if just wet keep it warm and dry indoors with a dehumidifier inside for some time (varies).
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post #4 of 30 Old 06-12-2012
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Re: De-watering wet core

Blue, if you look at the West Systems help files, they will show you how to rig a vacuum pump for vacuum-bagging fiberglass layups. Basically, you put a collection bottle in between the pump and the "donor" and any excess material accumulates in that bottle so it doesn't clog the pump. (One drawing is worth many words.)

Extensive wet core? I've heard of vacuums, and heaters as well, but the standard in boatyards is still "open it up and clean it out" AFAIK. Wet core is very slow to dry out, by any means.
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post #5 of 30 Old 06-12-2012
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Re: De-watering wet core

Balsa or Foam ?
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post #6 of 30 Old 06-12-2012
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Re: De-watering wet core

I would re-core before doing a temp fix. You are only prolonging the inevitable...
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post #7 of 30 Old 06-12-2012
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Re: De-watering wet core

This may be just me, and resale value may not matter to you, but if I were looking at a boat to buy and it had a half-measure job done on its soggy deck, such as sucking epoxy into a bunch of holes, I'd walk away.

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post #8 of 30 Old 06-12-2012
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Re: De-watering wet core

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Originally Posted by hellosailor View Post
Blue, if you look at the West Systems help files, they will show you how to rig a vacuum pump for vacuum-bagging fiberglass layups. Basically, you put a collection bottle in between the pump and the "donor" and any excess material accumulates in that bottle so it doesn't clog the pump. (One drawing is worth many words.)

Extensive wet core? I've heard of vacuums, and heaters as well, but the standard in boatyards is still "open it up and clean it out" AFAIK. Wet core is very slow to dry out, by any means.
I bought a high quality vacuum pump and used it for MONTHS on my rudder (in the basement). Did everything according to instructions. The vacuum was so perfect it actually collapsed the rudder, went from convex to concave.

The result: nil, nada, zilch. I cut it up later and it was completely soggy.

Waste of time and (lots of) money. Do it right, cut it open. It's the only thing that works.
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post #9 of 30 Old 06-12-2012
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Re: De-watering wet core

As other posters listed ..... open it up and do it 'right'.

The pregnant question is: knowing that you cant completely dry out a deck core with a single stage vacuum pump (6" hg. vac.) and any remaining wetness will prevent the epoxy from bonding .... do you really want to do this knowing that it most probably wont work?
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post #10 of 30 Old 06-12-2012
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Re: De-watering wet core

I have used this method on smaller repairs one square foot and smaller and it works very well. you have to pull the vacuum at one end and drill severel small holes at the other end to let dry air in. just pulling a vacuum will not work. you have to move the moist air out and dry air in for it to work. after drying I drill a hole pattern about 2" apart over the area. 1/4" to 3/8" holes put a small allen wrench in a drill motor and spin it in the hole to break up the old balsa core. suck out the balsa fibers with a shop vac. and fill with thickened epoxy ( micro spheres ). if you need it more solid then you repeat with a second hole pattern in between the first set of holes.
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Last edited by overbored; 06-12-2012 at 01:01 PM.
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core repair , cpes , fiberglass core

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