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

Richard Smith sailnut at worldnet.att.net
Fri Dec 3 09:49:12 EST 2004


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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