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Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Blisters
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Thread: Blisters Reply to Thread
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Topic Review (Newest First)
11-18-2007 12:19 AM
Gene T
Quote:
Originally Posted by Northeaster View Post
Is bottom paint (hard or ablative) actually waterproof?

Quote:
Not really.
I realize that it is applied to prevent growth. But does it actaully act to prevent water from entering the gelcoat and resin/fiber?

I don't believe my boat model is know to have blister problems, and my 30 year old hull (in water 7 months / year) does not have any, but after reading the above link on blisters, I guess it is possible to have water damage / weakening of the hull, without blisters.

Without the any apparant damage / blisters, it is hard to justify the work / cost of stripping down and applying a true barrier coat.

Thoughts?
If you don't have blisters on a 30 year old boat I wouldn't worry about it. Different manufacturers had different severity of problems. It seems to me late blistering started in the mid 70's and got really bad in the early to mid 80's. I have seen Islanders with 6 inch blisters, C&C with blisters to the core and Newports with none, all the same age.
11-17-2007 12:32 PM
Northeaster Is bottom paint (hard or ablative) actually waterproof?
I realize that it is applied to prevent growth. But does it actaully act to prevent water from entering the gelcoat and resin/fiber?

I don't believe my boat model is know to have blister problems, and my 30 year old hull (in water 7 months / year) does not have any, but after reading the above link on blisters, I guess it is possible to have water damage / weakening of the hull, without blisters.

Without the any apparant damage / blisters, it is hard to justify the work / cost of stripping down and applying a true barrier coat.

Thoughts?
11-17-2007 12:04 PM
daddyhobbit
boat type

CardiacPaul
Boat is 1984 Young Sun. Like the boat but worry about the blisters. There are many small blisters just above the water line. I have not had a survey done and think this may leave me some negotiation room.
Daddy Hobbit
11-16-2007 07:20 PM
cardiacpaul it might help to know what boat it is.
11-16-2007 05:52 PM
AjariBonten Xort, great aarticle. Thanks for the link.
11-16-2007 05:28 PM
xort Barrier coating to prevent blisters?

http://www.zahnisers.com/repair/blister/blister1.htm
11-16-2007 05:18 PM
Robby Barlow Run - probably

Worry - definitely

But then again repairs can be done it's all a question of price. If you really like the boat get a quote and make an offer with that in mind.
11-16-2007 04:53 PM
Gene T I will say it depends. How big? How many? What information can you get about when it was repaired, how bad it was before and who did the job.

I for one would not automatically run away from a boat with blisters, but I would expect to get the whole story and talk to the people who did the work. I would also expect to have the current blisters evaluated. And of course I would expect to get a good deal on the boat.

Blisters won't sink a boat and most boats in that era had blister problems. So I would check it out if you like the boat, but be very very critical.
11-16-2007 03:07 AM
sailingdog run... lots of boats out there that don't have a botched blister repair job.
11-16-2007 02:19 AM
Sailormann
Quote:
We are looking at a 1984 boat that has had barriercoat applied to its bottom. I imagine that it was because the bottom was blistered.
Prob'ly right
Quote:
In inspecting the boat I see some blisters just above the waterline. Should I be concerned?
Yup
Quote:
I know blisters never sank a boat, however, this is something that I worry about.
Me - I'd pass on the boat ... too many others out there. Either they didn't repair the ones above the waterline (which would make me wonder how well they did the ones UNDER the waterline), or the boat has been lying on it's side or had an awful lot of weight loaded on it or the moisture that was inside was not allowed to dry out before the barrier coat was applied and it has migrated and is coming out above the waterline - could be a whole bunch of causes but there's something not right. It's an unusual enough situation (being in a spot that is supposed to be OUT of the water, on a boat that is supposed to have had this repair done recently) that I'd be tempted to think there's an issue....

Good luck with whatever you decide...
Regards
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