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

Thu Dec 9 17:27:34 EST 2004

Todd,

Funny you should ask.  I once had to do a project that involved spray
coating an epoxy binder into a delicate nonwoven C-fiber batting.  The
unthickened epoxy was too viscous to atomize in a 2-fluid spray nozzle.
However, it turns out that uncured West system epoxy & catalysts (They are
really epoxy products made by the Dow Chemical Co. - shhh, don't tell
anyone!) are completely soluble in ketones like acetone or methyl ethyl
ketone (MEK).  If Lou is not getting good penetration into the cement; then,
he can thin out the uncured epoxy with acetone in practically any proportion
he needs to get the viscosity low enough.  Warning, the acetone will be
evaporating during and after application & will create a REALLY flammable
vapor in the vicinity of the cement.  So, good ventillation will be very
critical in this operation.

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Todd Tavares" <sprocket80 at mail.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Thursday, December 09, 2004 5:10 PM
Subject: Re: [Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC

> Roger,
>
>   Is there a way to thin a small amount of epoxy to brush onto the exposed
cement first?
>
> Todd
>
>
> ----- Original Message -----
> From: "Roger Pihlaja" <cen09402 at centurytel.net>
> To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> Subject: Re: [Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC
> Date: Thu, 9 Dec 2004 15:59:18 -0500
>
> >
> > 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
> > > > >
> > > > >
> > > >
> > > >
> > > > __________________________________________________
> > > > Use Rhodes22-list at rhodes22.org, Help?
> > > > www.rhodes22.org/list
> > > >
> > >
> > >
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > Jazz up your holiday email with celebrity designs. Learn more.
> > > http://celebrity.mail.yahoo.com
> > > __________________________________________________
> > > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> > >
> > >
> >
> >
> > __________________________________________________
> > Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>
> --
> ___________________________________________________________
> Sign-up for Ads Free at Mail.com
> http://promo.mail.com/adsfreejump.htm
>
> __________________________________________________
> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>
>
>