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Rob W View Drop Down
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Joined: 06 Jul 2014
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob W Quote  Post ReplyReply Direct Link To This Post Topic: bottom paint for a wood catamaran
    Posted: 07 Jul 2014 at 7:09am
Good morning.   I own a home built 17 x 9 sailing catamaran.   It was built in the 90's and is in very good condition. This is my second season with it. The previous owner told me a lot but is no longer available for current questions.

The hulls are painted with white Bright side s. The underlying marine grade plywood is supposedly sealed with epoxy. I had it in freshwater continuously for approx. Two weeks on an anual vacation and the top layer for paint started to come off in sheets below water line.

My question is I intend on day sailing with one vacation with a two week period of full wet. Will bright side work if prepped right? There were several slight cracks in paint when I got it.

Thanks for your help..........

Rob.......
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Rob W View Drop Down
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Joined: 06 Jul 2014
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob W Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 2014 at 4:36pm
To follow up with my original question - is there anyway to speak with an Interlux expert? Our do I need to seek out a knowledgeable sales rep at one of their distributors. I currently have not had luck with the local marine outlets.

Thanks for any replies. Rob W..........
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Ted@Interlux View Drop Down
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Joined: 15 Jul 2014
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ted@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jul 2014 at 2:41pm
Rob:  Give me a holler at 1.800.468.7589.
 
For the rest of you...Topcoat are not designed for submerged surfaces.  They do not build enough film cost-effectivly to keep water for passing through.  The result is eventually they will blister and peel.  This is made even worse by being in warm, fresh water.  It can happen in as little as 24 hours, and will not be evident until haul-out and the hull dries.  Then you'll see the blistering.  Water passes though to the underlying surface, but cannot pass back out quickly enough before it heats up, expands and lifts the paint with it.  The cracks that you mentioned probably made the situation worse, but are not the cause. 
 
Interlux offers a product for this situation.   It's highlighted in the link below.  Even old Awlgrip farts like me recommend its use on those bottoms that do not require antifouling capability (waste of money in this circumstance), spending the majority of their time on a trailer/hard.  
 
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