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

[Lou Rosenberg]

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
>>
>>
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>
>
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