[Rhodes22-list] CB trunk Surgery - Roger's Recommended MOC
Lou Rosenberg
lsr3 at MAIL.nyu.edu
Thu Dec 9 19:32:04 EST 2004
>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?
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>> > > > >
>> > > > >
>> > > >
>> > > >
>> > > > __________________________________________________
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>> > >
>> > >
>> > >
>> > >
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