[Rhodes22-list] Re: CB trunk, bottom paint

[Bill Effros]

Lou,

Fouling questions are highly localized..  In the cove Bruce and I moor 
our boats, a centerboard can get locked up after 6 weeks of non-use even 
using the top rated anti-fouling paints which were tested in our waters.

I think this all has to do with how still the water remains inside the 
centerboard trunk if you are not moving the centerboard up and down.  
The paint probably doesn't ablate very much..

Bill Effros

PS -- Haven't forgotten the IMF--working out the details.

Richard Smith wrote:

>As you know I have strong reservations about exposing a single season
>compound to the air for much more then a week or so.
>
>I would buy a quart of Micron multi season apply that HEAVILY and then close
>up the trunk.  The paint will cure way before spring and since there will be
>little in the way of ablation (in the trunk) one heavy coat should be OK.
>
>Remember the trunk can foul all it wants.  The growth is not going to impact
>sailing performance.  It will only impede operation of the board. The Micron
>will strongly discourage growth and if you regularly exercise the board and
>wash and scrape away as much of the accumulating growth as you can in the
>fall  I believe the whole thing will become a non-issue.
>
>When you replace the CB pendant you can completely scrape and repaint the
>trunk.
>
>After 2 years sailing on Rockaway Inlet I could find no reason for concern
>on this issue
>
>You will need a 2nd coat on the board but that can wait till spring.
>
>Richard Smith
>
>
>----- Original Message ----- 
>From: "Lou Rosenberg" <lsr3 at MAIL.nyu.edu>
>To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
>Sent: Thursday, December 02, 2004 5:32 PM
>Subject: Re: [Rhodes22-list] Re: CB trunk, bottom paint
>
>
>  
>
>>Roger, Richard,
>>  I am very anxious to finish this project before the weather degrades
>>to cold nasty days, and wanted your opinions on pushing the envelope
>>for using  a bottom paint when the ambient temp is around 50F??
>>  I will of course read the instruction on  Pettit's Trinidad before I
>>buy if I can find it in a store in NYC,  I have the PS 2003 issue
>>which listed and evaluated all the bottom paints and will see what I
>>can find. My only other choice after I am assured my board will not
>>jam again, is to put it back together without using all the bolts and
>>paint in the spring.
>>  any ideas?
>>  Lou
>>
>>
>>    
>>
>>>Richard,
>>>
>>>High CuO content bottom paints with a hard epoxy binder function by
>>>      
>>>
>slowly
>  
>
>>>leaching the copper to the surface.  Since the CuO is already in an
>>>      
>>>
>oxidized
>  
>
>>>state and the epoxy binder is inert to oxygen at room temperature, air
>>>exposure should have no effect upon these properties.  Pettit Trinidad
>>>      
>>>
>was
>  
>
>>>developed for use in extreme fouling tropical conditions, i.e. like the
>>>Caribbean Sea where the island of Trinidad is located.  Since sea water
>>>      
>>>
>does
>  
>
>>>not have a very high cuprous ion content, there should be no suppression
>>>      
>>>
>of
>  
>
>>>the biocide solubility.  I don't think Lou should use one of the ablative
>>>      
>>>
>or
>  
>
>>>sloughing bottom paints inside his centerboard trunk because of the close
>>>clearances and potential for mechanical and abrasive wear.  I suggested
>>>Petit Trinidad because it dries to a very hard slippery finish and should
>>>last as long as anything else currently on the market.  Naturally, you
>>>      
>>>
>would
>  
>
>>>also want to coat the centerboard with bottom paint & I would think
>>>      
>>>
>Pettit
>  
>
>>>Trinidad would be a good choice here as well.  With so much CuO around on
>>>both the centerboard trunk & the centerboard, I don't think marine growth
>>>will have much of a chance to get started.  But, your point regarding
>>>raising & lowering the centerboard a couple of times per week is well
>>>      
>>>
>taken
>  
>
>>>& would be cheap insurance.
>>>
>>>Roger Pihlaja
>>>S/V Dynamic Equilibrium
>>>
>>>----- Original Message -----
>>>From: "Richard Smith" <sailnut at worldnet.att.net>
>>>To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
>>>Sent: Wednesday, December 01, 2004 3:11 PM
>>>Subject: Re: [Rhodes22-list] Re: CB trunk, bottom paint
>>>
>>>
>>>      
>>>
>>>> < The high CuO
>>>> > >content should keep the fouling at bay for years inside a
>>>>        
>>>>
>centerboard
>  
>
>>>> trunk.>
>>>>
>>>> I don't think this will work in salt water!  Once exposed to the air
>>>>        
>>>>
>these
>  
>
>>>> seasonal coatings lose much or all of their antifouling properties.
>>>>        
>>>>
>It's
>  
>
>>>> possible to revive them (slightly) by sanding.  Difficult to sand the
>>>> interior of the trunk though.
>>>>
>>>> The issue of centerboard trunk fouling (in boats always in the water)
>>>>        
>>>>
>has
>  
>
>>>> never been successfully addressed.  I think the best approach is to
>>>>        
>>>>
>paint
>  
>
>>>> the board itself with a quality antifouling compound and lower and
>>>>        
>>>>
>raise
>  
>
>>>it
>>>      
>>>
>>>> a couple of times every week.  This will go along ways towards
>>>>        
>>>>
>eliminating
>  
>
>>>> marine fouling in the trunk.  By following this schedule my boat had
>>>>        
>>>>
>>>always
>>>      
>>>
>>>> had very little hard growth  in this area.
>>>>
>>>> Richard Smith
>>>>
>>>>
>>>> __________________________________________________
>>>> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>>>>
>>>>
>>>>        
>>>>
>>>__________________________________________________
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>>>      
>>>
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>>    
>>
>
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>  
>