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Old 26-05-2011, 03:56   #16
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pirate Re: Blisters - Advice Sought

From what I can see in the pic's I'd go along with Minarets advice... no need for a peel or anything drastic... just sand off the crap till you've clean white GRP then either 2000 or VCtar.....
One thing while sanding it back.. if you start getting rings of anti foul... white/colour/white like this 0... then you've blisters under the gel coat starting up... this colour ring is last to go in blisters hard to spot with the naked eye...

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Old 26-05-2011, 04:17   #17
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Re: Blisters - Advice Sought

We went through a similar problem on our boat. We had blisters which were appearing over a "mystery coating" that even had the Interlux guys stumped. While we never did figure out what the heck they tried to use previously, we took the additional hit to have the bottom completely stripped. We waited a few weeks for the hull to dry, then blisters epoxied and ground, barrier coated, then we were ready for the regular old bottom job.

I would bite the bullet and have it taken down completely. You can either take the hit now or later but it will have to be done eventually so might as well get on with it.

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42 Nassau Undergoing refit in Kemah, Tx
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Old 26-05-2011, 05:34   #18
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Re: Blisters - Advice Sought

We hauled ours last year, found a quite a few what looked like blisters, but generally looked good, slipway suggested wet blasting all old antifoul off so we could see what we were dealing with, as you can see from the photos, it was not what we had expected, even the slipway foreman was suprised. Many years of PO repairs. will be a lot of grinding out and glassing, some were repaired properly but 75% were just quick fixes.
As you can see from one of my photos I have circled a blister, bulges out and when opened up oozes a sticky smelly liquid. The wet sand popped most of them the others we opened up, have washed a number of times, and she has been drying out ever since (whilst I refit interior) you might be suprised what you find under yours.
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