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post #11 of 15 Old 09-23-2012
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Re: Blister repair prep

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The best method is to use a hose and plenty of water - FYI you are not trying to 'dry' out the area from water, although drying is the term people use. Google blister causes

SchockT - #101 had blisters ?
No, I have never found a single blister on my Santana! It is a very well laid hull!

The boat I had blisters on was my Hotfoot; a trailer boat that I was keeping in a slip.

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post #12 of 15 Old 09-23-2012
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Re: Blister repair prep

Do nothing at all about blisters. Instead read David Pascoe's articles on the subject. All blister fixes make the non-problem worse allowing more moisture to be drawn along the exposed fibers. At worst, blisters are a cosmetic issue. Attempts to fix them ussually result in more damage than the blister.
Been there, done that, regretted it.
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post #13 of 15 Old 09-23-2012
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Re: Blister repair prep

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Originally Posted by Frogwatch View Post
Do nothing at all about blisters. Instead read David Pascoe's articles on the subject. All blister fixes make the non-problem worse allowing more moisture to be drawn along the exposed fibers. At worst, blisters are a cosmetic issue. Attempts to fix them ussually result in more damage than the blister.
Been there, done that, regretted it.
I don't see it. How could leaving the pocket of water inside the laminate layers be better than eliminating the water and filling the void? Perhaps a poor repair job could make things worse, but repaired correctly it certainly won't!

From a performance perspective blisters are more than cosmetic. If the hull isn't fair it isn't fast! I know many cruisers don't care how lumpy their bottoms are, but some of us have higher standards than that!

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post #14 of 15 Old 09-24-2012
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Re: Blister repair prep

ALL blister repairs make matters worse (or at least most). It is not possible to "dry" the hull because ti really isn't wet. The blisters are filled with "gunk" that is hydrolyzed resin that does not really dry. Attempting to repair them simply opens more pathways for water to wick into the gelcoat and hydrolyze more.
Blister repair is one of boatings biggest scams.
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post #15 of 15 Old 09-24-2012
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Re: Blister repair prep

Frog,

While I respect your opinion, I don't happen to agree with you in everything you've said.

Think about the chemistry and physics for a moment. The hydrolyzed resin is mildly acidic. Left alone, it will continue to hydrolyze increasing amounts of cured resin. This is akin to a very slowly growing cancerous tumor within your body.

When filling opened up blisters, almost everyone recommends using epoxy. Epoxy is not water permeable. The schedule is a wet-out with epoxy, followed by applications of thickened epoxy. The choice of thickener is also important -- a non-absorbent filler like Cab-o-sil is the way to go. Deeper repairs should include use of cloth (bi-axial is a good choice in many cases.) Once the area is faired, another coat or two of epoxy to seal the repair.

Most solutions for blistering also include application of an epoxy barrier coat, either over the top of the repaired area or better yet, the entire hull.

When done properly, a repair is pretty much impregnable to water.

However, if corners are cut and a few steps ignored, or inferior products are used then you are destined for future work.

Last edited by PorFin; 09-24-2012 at 10:41 AM.
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