Are these blisters, cracks, or what? - Page 2 - SailNet Community

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  #11  
Old 08-09-2013
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Re: Are these blisters, cracks, or what?

boatpoker, you are correct, glass cannot rot...but from direct experience: I had to work on a boat with a compromised keel where there was a layer of black mush with fibres embedded in it that certainly looked "rotten" - clearly the remains of mat which was not fully whetted out. Possibly a batch of epoxy was improperly mixed, resulting in a "soft spot" too deep to show as a blister? Anyway, this was in an epoxy hull boat; I have less experience with polyester resins.

I *think* - and am more than willing to be corrected - that some roving is not 100% glass, but sometimes a glass/polyester mix. Also open to other suggestions.

So I a probably off base here, but the problem looked almost identical - and I stick to my hope it is a "false keel" problem!
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Old 08-10-2013
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Re: Are these blisters, cracks, or what?

On the hard for a while, and she has purged herself of moisture. Great. Open up the crack, epoxy it closed. Done. Sell the boat.
If you want, and I maybe wrong, but then take advantage of the hulls dryness and put on a barrier coat all over it, for the next owner. Super.
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Old 08-10-2013
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Re: Are these blisters, cracks, or what?

I had the same problem with my Caliber 33 which has an encapsulated keel. There was a crack in the bilge (bad repair job by a PO) that allowed water from above to leak down into the keel and eventually out through a spot low on the keel. I drilled out the spot where the water was seeping out, to find that it had undermined the concrete the builder had used to fill in the spaces around the iron billets used for ballast.

We started the repair with a temporary repair in the bilge to ensure no more water would pass through. (Also put a new mast boot on the mast at deck level).

On the keel, we ground out an area about 2 feet across, brushed out all the loose concrete, put a heat lamp on the area from early May until mid July. Then repaired the area using a rust encapsulating 'paint' on the exposed iron, filled with a hydraulic, vinyl concrete, laid up multiple layers of glass and faired out with epoxy. Then went back to the bilge, ground out the temporary repair, and effected a proper repair of the bilge with several layers of glass and epoxy.

Since these repairs were beyond my skill level, I paid the yard to do the work. Total cost was about $2500, of which $2000 was labor. The iron only rusted after it was exposed to open air, so rust was not an issue. As the water ran into the keel, it had followed the seam between the glass and the ballast, so the whole keel was not affected. So fear not; the problem you face is probably not catastrophic and cost of repair might not break your piggy bank. And odds are that, after repair, your boat will out live you and her next owner.
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Re: Are these blisters, cracks, or what?

Looks like iron oxide weeping through a coating. Since you say you have an encapsulated keel, my money is on a leaking encapsulation.

I'd grind it open to see what I was dealing with.
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Re: Are these blisters, cracks, or what?

I would agree with the theory of ( punchings ) ...Problem becomes rust is on the order of seven times the volume of iron...
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Old 01-22-2014
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Re: Are these blisters, cracks, or what?

The worst stains make me suspect an iron keel. Do you know what the keel ballast is.
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