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

[Lou Rosenberg]

  Roger,
  Much thanks again for the detailed analysis.   We'll talk again when 
I upload the new pics from Saturday's visit.
  be well
  Lou


>Lou,
>
>Since I presume you don't want to have to get up inside the centerboard
>trunk to repaint again any time soon, I would suggest using one of the hard
>epoxy-based cuprous oxide bottom paints.  Pettit Trinidad would be a good
>choice.  The red color has 75.8%wt CuO, which is about the highest biocide
>content I've seen in any bottom paint.  The stuff will dry to a hard
>slippery finish that won't sluff off or ablate away with time.  The high CuO
>content should keep the fouling at bay for years inside a centerboard trunk.
>
>You may be correct in your hypothesis regarding the swelling of the FRP
>composite inside your centerboard trunk.  However, there is another
>possibility.  Due to a hard grounding or the boat being dropped during
>launch or retrieval, the liner in the centerboard trunk may have delaminated
>and buckled in compression.  An internal build-up of water with freeze/thaw
>cycles may have produced a similar effect.  If you find water inside the
>shoal draft keel with your pilot hole; then freeze/thaw damage is almost
>certainly the cause of the bulge.  I don't think you want to reduce the
>thickness and strength of the FRP laminate by grinding away the bulge.
>
>Let's talk some more after you've taken your pictures and drilled your test
>pilot hole.
>
>Roger Pihlaja
>S/V Dynamic Equilibrium
>
>
>----- Original Message -----
>From: "Lou Rosenberg" <lsr3 at MAIL.nyu.edu>
>To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
>Sent: Wednesday, December 01, 2004 11:05 AM
>Subject: [Rhodes22-list] Re: CB trunk, bottom paint
>
>
>>  Roger,
>>
>>    Can you recommend a bottom paint for my CB trunk once I get it sanded?
>>
>>    I am going to try to pu the WEST SYS book on Fibreglass repair and
>>  Maintenance today if possible at WM.   I am praying that my trunk is
>>  not damaged due to water and the bulges I have noticed are not that
>>  much of an obstruction for sailing.  If  i need  to remove the board
>>  again using a jack from the bottom- I can deal with that.  I dont
>>  think i want to rip open my trunk if the (possible) delamination will
>>  allow me to sail it.   But I am going to assess it on Sat and will
>>  bring my dig cam to take  CU pics. I will grinding away some of the
>>  paint from the bottom of the keel near the trunk and will drill a
>>  pilot 3/16" hole to see if water is apparent.
>>    Lou
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>>
>
>
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