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  #1  
Old 05-14-2009
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preemptive barrier coat

Hi all,

I have recently purchased a 1969 Iroquois MkII catamaran, it should be showing up at the boatyard in Massachusetts early next week.

Now, the boat has no blisters, but I believe it has been in freshwater (Lake Huron) for most of its 40 years.

I'm nervous of what might happen when she's splashed into the saltwater after a season (or two or three), as blistering is much more prevalent in saltwater and this is a fairly old hull.

So, my question is, does it make sense to do a preemptive barrier coat? Or should I wait and worry about blistering if/when it happens?
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Old 05-14-2009
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If you don't have a blistering problem now and the boat has been stored on the hard all winter, barrier coating might make sense... but you'd want to check the moisture content of the laminate first.
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Old 05-14-2009
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my vote would be to do everything you can when its still out of the water, thru hulls, fair, paint, everything you can think of. then you have a few years years of not needing to worry about it.
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barrier coating a wet hull serves little purpose.
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Blister Detection Before Barrier Coat

Don't some blisters close up and disappear after the hull dries, making them difficult to detect? Pinhole blisters in particular.
I remember a Catalina on the hard that did this and the pinhole blisters were only seen when the hull was sanded completely clean of all bottom paint, and then they were hard to see. The holes were very, very small but there were a lot of them.
What would be the best way to handle that? Would a hammer sounding reveal anything? A moisture meter? Or is a close visual check the only way to find that kind of blister.
What would happen if you barrier coated without filling the blisters?
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Old 05-14-2009
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See if you can survey some Iroquois owners. Much depends on the lay-up...

Quote:
Originally Posted by LookingForCruiser View Post
Hi all,

I have recently purchased a 1969 Iroquois MkII catamaran, it should be showing up at the boatyard in Massachusetts early next week.

Now, the boat has no blisters, but I believe it has been in freshwater (Lake Huron) for most of its 40 years.

I'm nervous of what might happen when she's splashed into the saltwater after a season (or two or three), as blistering is much more prevalent in saltwater and this is a fairly old hull.

So, my question is, does it make sense to do a preemptive barrier coat? Or should I wait and worry about blistering if/when it happens?
and the resins used. If it was a Gemini, it would be at very high risk. If it were a Stiletto it would be at no risk. You made to troll British sites.

But SD is dead on if you can't get good info. If the hull is dry, you do have to strip it, but after that it's easy.
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I asked a similar question of a boatyard expert in CT...but it was about a new boat..should I use barrier coat under the Micron antifoul?

He said that the blistering is more of a problem in warmer waters and that using the Micron bottom paint was fine....which I am glad of because that would have been a LOT more work.

Not sure if that pertains to an old boat just the same, but the guy seemed to know what he is talking about....has been in the brokerage biz for many years.
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Old 05-15-2009
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The hull is reasonably dry, it's been on the hard all winter. However on the hard in Canada means several feet of snow surrounding it... but that melted a few weeks ago.
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Old 05-15-2009
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In that case, I would go ahead and strip the bottom and barrier coat it.

Quote:
Originally Posted by LookingForCruiser View Post
The hull is reasonably dry, it's been on the hard all winter. However on the hard in Canada means several feet of snow surrounding it... but that melted a few weeks ago.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Old 05-17-2009
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If a boat built in 1969 was going to blister it'd have likely got around to it by now. Paint it, sail it.
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