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 Post subject: Osmotic Blisters
PostPosted: Tue Oct 11, 2011 12:51 pm 
Site Rank - Admiral

Joined: Tue Jul 19, 2011 7:15 am
Posts: 211
Location: Indialantic, FL
Looking at buying a Hobie 18 that has some osmotic blisters about the size of a dime. Obviously the boat was either in water or moist grass for a while to cause them, but it's been dry on a trailer now for over a year. Will the blisters get worse with time or are they likely dormant now? I assume the repair entails grinding out, drying, and filling. Should I consider this boat (at a good price) or move on?


2007 Hobie Tiger

 Post subject: Re: Osmotic Blisters
PostPosted: Wed Oct 26, 2011 11:55 am 
Site Rank - Captain

Joined: Tue Oct 21, 2008 10:51 am
Posts: 87
Location: Atlanta, GA
You're lucky that it has a few large osmotic blisters. My H-16 had hundreds of small blisters that were 4-6mm in addition to a few big ones. It took several days to break open each one and then fill all of them back.
If you leave them and you are in an area that freezes, they will break through the gelcoat after a few freeze thaw cycles. Then, the fiberglass will be able to start absorbing water.
Good luck! It is a fun winter project.

Eric Weller
2006 F18 Capricorn
1980 H16
Keep the pointy side up!

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