McLube for plate flange glassing

[Horace Greeley]

Terry,

At 04:12 PM 4/7/2004, you wrote:
>What is boat resin?

A specialized resin used for repair/building of fibreglass boats.  It mixes 
and flows readily, with a good cure time (not too long/not too short), and 
fills in porous materials better than other things I have tried.  Usually 
available from marine hardware stores.

I do agree about using the thinnest acceptable material between block and 
plate when using glass/epoxy.  If anyone does find a mold release that 
works, I'd like to know about it...perhaps something that is painted or 
smeared on, rather than sprayed?

Still, it goes to what one is comfortable working with, under what 
circumstances.  Boar resin, for example, is really safely used (mostly) out 
of doors.  Before trying anything, I would want to carefully read the 
Materials Data Sheets to see if there was anything there that was 
particularly objectionable.  A good deal of this is personal preference and 
experience - what works very well for one person may be a disaster for 
another...so, we compare notes and try to gain knowledge (and with it, 
perhaps a bit of wisdom).

Best.

Horace



>Terry Farrell
>
>----- Original Message -----
>From: "Horace Greeley" <hgreeley@stanford.edu>
>To: <davidlovepianos@earthlink.net>; "Pianotech" <pianotech@ptg.org>
>Sent: Wednesday, April 07, 2004 1:42 PM
>Subject: Re: McLube for plate flange glassing
>
>
> >
> > Hi, David,
> >
> > At 07:24 AM 4/7/2004, you wrote:
> >
> > >Has anyone used McClube 444A for preparation of the plate flange prior to
> > >glassing?  It is, afterall, a mold release formula.
> >
> > Yes - but it is for use with plastic/resin/metal molds, not cast iron.
> >
> > >   Does it provide
> > >adequate release properties for epoxy?
> >
> > No.  The iron is too porous.  What did work, but was far too labor
> > intensive, was to "butter" the plate with fairly thin boat resin.  The
> > problem with that was working with resin that was sufficiently thin to
> > penetrate the plate (at least somewhat) and yet sufficiently thick so as
> > not to pool up too much.  Altogether too much trouble....so, I went back
>to
> > either wax or plasticized kraft paper. YMMV.
> >
> > Best.
> >
> > Horace
> >
> >
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> >
>
>
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