[Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC

[Steve]

Thanks Roger
Well the fibreglass is definitely the best route.  But
I didn't think he had a real big hole that he was
dealing with.  I have seen 3M 5200 do some real good
patch work.  I guy with a Clysler 22 had water comeing
in at the swing keel bolt.  Boat kept sanking.  One
day Bill & I when over to talk to him & he show us
where the water was coming in at.  He put all kinds of
epoxic patch there but due to the keel bolt that the
swing keel attaches to is expose; the movement of that
bolt kept causeing it to leak.  Since it wasn't my
boat:-) we suggusted sanding the fibreglass around the
bolt & covering the whole bolt & about 6 inch circle
around it in 3M 5200.  It quit leaking there and is
still floating 4 years later.  But it still looks like
a piece of junk boat but he seem happy with it:-)That
3M 5200 can do some good patch work in a pinch.
Steve

   
--- Roger Pihlaja <cen09402 at centurytel.net> wrote:

> Steve,
> 
> MOC property = Material Of Construction property
> 
> What I was refering to was to trowel in uncured 3M
> 5200 polyurethane
> adhesive directly over the cement.  The 3M 5200
> would be the patch in this
> case.  Even cured, this material is no where near
> stiff enough for this
> application.
> 
> I wouldn't use 3M 5200 to attach some other patch
> material to the cement
> either.  3M 5200 is too viscous to properly soak
> into the cement to develop
> a strong bond with it.
> 
> I suggested using untickened epoxy as a tie layer
> with the cement.  The low
> viscosity epoxy will soak into the porosity in the
> cement, creating a deep
> mechanical & chemical bond with the cement.
> 
> Roger Pihlaja
> S/V Dynamic Equilibrium
> 
> ----- Original Message -----
> From: "Steve" <rhodes2282 at yahoo.com>
> To: "The Rhodes 22 mail list"
> <rhodes22-list at rhodes22.org>
> Sent: Thursday, December 09, 2004 3:43 PM
> Subject: Re: [Rhodes22-list] CB trunk Surgery -
> Roger's Recommended MOC
> 
> 
> > Roger
> > 3-M 5200 polyurethane caulk to
> > > build up the patch as some
> > > others have suggested.  Polyurethane caulk has
> the
> > > wrong MOC properties for
> > > this application.
> >
> > I don't get what you mean here.  I wasn't talking
> > about building up a patch with 3M 5200; 3M 5200 is
> the
> > patch if you when that route.  Also, what are you
> > talking about when you say MOC properties?
> > Steve
> >
> >
> > --- Roger Pihlaja <cen09402 at centurytel.net> wrote:
> >
> > > Lou,
> > >
> > > I would use prefabricated G-10 sheets.  G-10 is
> a
> > > composite material made
> > > from oriented glass fiber & epoxy and it is very
> > > stiff.  You will be able to
> > > cut it with a saber saw to an exact fit into
> > > whatever size & shape the hole
> > > in your centerboard well ends up being.  You can
> > > order G-10 in panels as
> > > small as 12 inch X 12 inch up to as large as 36
> inch
> > > X 48 inch in any
> > > thickness ranging from 1/32 inch to 2 inch.  Use
> an
> > > unthickened epoxy tie
> > > layer soaked into the cement and also on the
> cement
> > > side of the G-10 patch.
> > > Then, I would use a fiberglass tape laminated
> with
> > > epoxy to bridge the
> > > remaining gap between the G-10 patch and the old
> > > centerboard well.  The
> > > centerboard well side of the G-10 patch will
> still
> > > need the final coat of
> > > epoxy loaded up with West 422 Barrier Additive.
> > > G-10 sheets can be ordered
> > > from:
> > >
> > > McMaster-Carr Supply Company
> > > 473 Ridge Rd.
> > > Dayton, NJ  08810-0317
> > > 732-329-3200 (Sales)
> > > www.mcmaster.com
> > >
> > > Tell them you want "Grade G-10/FR4 Garolite" in
> > > whatever sheet size &
> > > thickness you need.
> > >
> > > Note, do not use 3-M 5200 polyurethane caulk to
> > > build up the patch as some
> > > others have suggested.  Polyurethane caulk has
> the
> > > wrong MOC properties for
> > > this application.
> > >
> > > 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: Thursday, December 09, 2004 11:22 AM
> > > Subject: Re: [Rhodes22-list] CB trunk surgery
> > >
> > >
> > > > Roger,
> > > >    I purchase a small cutting disc for my
> dremel
> > > yesterday and hope to
> > > > begin the work on Sun.
> > > >    My plan is to:
> > > >     Remove the cement which is causing the
> bulge,
> > > then I will have to
> > > > insert a  thin plastic or metal piece to cover
> the
> > > cement as the
> > > > epoxy will not bond directly to the cement
> > > effectively.
> > > >   I will sand the thin plastic down for good
> > > adherance  quality and
> > > > hope to just fit it under snugly to the
> > > surrounding trunk.
> > > >   any comments/ suggestions??
> > > >   Lou
> > > >
> > > >
> __________________________________________________
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> > > >
> > >
> > >
> > >
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> >
> >
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> 
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