[Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC
Roger Pihlaja
cen09402 at centurytel.net
Thu Dec 9 20:10:38 EST 2004
Lou,
If the acetone (2-propanol) evaporates too quickly; then, you can use methyl
ethyl ketone (MEK) (2-butanol) as a thinning solvent. The boiling point of
acetone is 56.2 deg C vs. 79.6 deg C for MEK. So, MEK will evaporate much
more slowly than acetone. However, be careful because MEK is considerably
more toxic than acetone.
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 7:32 PM
Subject: Re: [Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC
> >Todd, Roger:
>
>
> Roger,
> One of My first experiment w WS epoxies I tried using acetone to
> lower viscosity and it does evap very quickly and of course creates
> more flammable fumes besides the epoxy fumes.
> thanks for that option.
> L
>
> >
> >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
> >> > > > >
> >> > > > >
> >> > > >
> >> > > >
> >> > > > __________________________________________________
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> >> > > >
> >> > >
> >> > >
> >> > >
> >> > >
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> >> > >
> >> >
> >> >
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