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

[Roger Pihlaja]

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
> > >
> > > __________________________________________________
> > > Use Rhodes22-list at rhodes22.org, Help?
> > www.rhodes22.org/list
> > >
> > >
> >
> >
> > __________________________________________________
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> >
>
>
>
>
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