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Author Topic:   Bottom Blisters
ghwillis posted 07-06-2001 01:12 PM ET (US)   Profile for ghwillis   Send Email to ghwillis  
I am looking at a 1979 Montauk 17' hull which has been used soley on Lake Erie. There appear to be numerous blisters along the bottom in an area about 1-2 feet on either side of the center. None are cracked or open, but bumps about one quarter inch in diameter. Are these a problem?
Samars posted 07-06-2001 01:42 PM ET (US)     Profile for Samars  Send Email to Samars     
Just a thought....and I am not the most well versed (learning all the time) but could these be marks or even repair marks from an incorrect trailer...
You may want to check out the trailer... ask if the owner trailered his boat on and off many times...
george nagy posted 07-06-2001 02:14 PM ET (US)     Profile for george nagy  Send Email to george nagy     
Those sound like blisters in the fiberglass/ gelcoat caused by water seeping into the gelcoat. This can be both expensive and expansive repairs. I am sure there are past posts on fiberglass repair of this nature.Maybe someone knows exactly the post.
ghwillis posted 07-06-2001 02:28 PM ET (US)     Profile for ghwillis  Send Email to ghwillis     
I can clearly see bubbles in the gelcoat which make up the blisters. The boat was in the water(fresh water) during the summers and winter stored in a garage. These things are spaced about 4 - 6 inches apart.
Arch Autenreith posted 07-06-2001 03:52 PM ET (US)     Profile for Arch Autenreith  Send Email to Arch Autenreith     
ghwillis.
I have an '84 that was used on Pymatuning. (Fresh water also.) I also have / had about 100-200 blisters. When I had it over on it's side repairing a hole I repaired 1/2 of them following the West System guides. Many of them were so minor that once I ground through the gelcoat there wasn't any obvious evidence in the glass underneath. I still have to do the other half. Maybe this Spring. Many of them were so small all I did was use a wooden block with the sandpaper and sanded the gelcoat 'bump' smooth. Maybe the count was closer to 50-100 but a lot, regardless.
bc posted 07-06-2001 07:11 PM ET (US)     Profile for bc    
Blisters are common place on fiberglass boats, and seem more common in the fresh water boats. Both my 15' sport and my sundance skiff have some blisters. Boats that are trailered may develope blisters around the carpet bunks. Yachtsurvey.com discuses this issue with great detail, worth reading.

Also, boats with blistard sides means that its been stored on the water which would lead me to check out the motor foot seals.

Bigshot posted 07-07-2001 09:21 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Exactly as described. Gelcoat is porus and water has soaked into it and made a blister. If small, purely cosmetic. You can fix or leave alone until they get bigger than a nickel or so, if they ever grow. I had them on a Hobie Cat the size of quarters, just looked ugly. I personally would just sand them smooth and touch it up with a liquid gelcoat or epoxy if it worries you.

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