Re: Large blister repair - adequate?

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Posted by B.B. on February 14, 2005 at 06:57:49:

In Reply to: Large blister repair - adequate? posted by Gerhard on February 14, 2005 at 06:54:29:

Posted by Bengt Blomberg on February 13, 2004 at 13:22:20:
In Reply to: Large blister repair - adequate? posted by Gerhard on February 13, 2004 at 06:13:45:
Hello Gerhard!
My answer to both of your questions are NO!!!
There is no way such a repair can stop the process. It will go on and slowly make the hull weaker even if the epoxy coating might not blister for a long time. The only safe way to check before buying is to meassure the moisture all over the bottom and mark out the worst spots. Then drill a few conical holes with the tip of a 1/2" drill bit through 3/4 of the laminate or into the core if it is a core type hull. Use a magnifying glass and check for black or brown coloured layers in the hole or better buy some blue lithmus paper strips in a drugstore. Don't buy the type that can show both acid and alcali. They are almost impossible to interprete for this purpose. The blue one simply becomes more or less red if there is acid in the laminate. They are as effective that one can se the difference between hydrolysed and not yet hydrolysed layers.
If the strips becomes orange or red or dark coloured layers can be seen, count with anything between $300 and $600 / square meter for a proper treatment (of which at the moment HotVac is the only available).
If the seller does not allow drilling, don't buy the boat!!! The holes are easily and everlasting filled with epoxy filler.
Regards Bengt

: Posted by Gerhard on February 13, 2004 at 06:13:45:
: I am interested in purchasing a sailboat that had a large blister repair job done a couple of years ago. The blisters were ground out to good fiberglass, washed and dried for several months. Fiberglass mat and epoxy were then used to fill the ground out depressions. The whole hull was then faired and an epoxy barrier coat used. I do not know the actual size of the blisters, but from photographs I have seen, the ground out areas were quite large.
: A surveyor has suggested hauling the boat and letting it sit for a week or so to remove residual moisture from the hull, then use a moisture meter and sound the hull to check the integrity.
: My question is does the repair seem adequate and would this type of survey give me a good indication of the condition of the bottom and future problems I might have?
: Gerhard

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