[alberg30] Fiberglass matt & epoxy

[Rick Leach]

From: Rick Leach <RLeach at mbayaq.org>

Guy,

I have never used mat with epoxy.  All of the literature that I've come
across talks of cloth, though I wouldn't rule out woven roving.  I suppose
that if you're looking high build then heavier cloth is the way to go.  I
think part of the beauty of using mat with polyester is that is promotes a
good bond between the alternate layers of cloth or roving.  But the bonding
characteristics of epoxy are so far superior to polyester that it's a moot
point.  Another rule to remember: epoxy will bond very well to polyester,
but not vice-versa!  That includes gel-coat.  If you want to gel-coat over a
repair do not use epoxy, the gel-coat will not adhere.  Fortunately for me,
every surface aboard Sugar Magnolia has been painted (some surfaces many,
many times), so matching gel-coat (which I've found to be very difficult) is
unnecessary and I use epoxy for most repairs and small projects.  In my
case, the only reason to use polyester is cost.  For example, for my
soon-to-be-started seahood project, there is enough material involved that
epoxy would make the project substantially more expensive, so polyester with
cloth, mat and a foam core is how I'm going to go.  

There, that's probably worth about 2 cents, huh?


Rick Leach
Sugar Magnolia, #121
www.angelfire.com/ca/Alberg30

> ----------
> From: 	Guy Lalonde[SMTP:lalondegc at videotron.ca]
> Reply To: 	alberg30 at onelist.com
> Sent: 	Wednesday, February 16, 2000 5:27 PM
> To: 	alberg30 at onelist.com
> Subject: 	[alberg30] Fiberglass matt & epoxy
> 
> From: Guy Lalonde <lalondegc at videotron.ca>
> 
> Is there a glass matt that is compatible with epoxy ?  I haven't found any
> up my way. The catalogs I've seen all say compatible with polyester resin
> (they don't mention anything about epoxy). When you ask a salesperson,
> they
> all say "Oh yeah, of course". Not convincing to me.
> 
> If there is no such thing as epoxy compatible glass matt, what would you
> use
> instead if you wanted to stick with epoxy ?
> 
> Guy
> Cyrena #466
> 
> ----- Original Message -----
> From: <Rap1208 at aol.com>
> To: <alberg30 at onelist.com>
> Sent: Wednesday, February 16, 2000 12:47 AM
> Subject: Re: [alberg30] rudders
> 
> 
> > From: Rap1208 at aol.com
> >
> > Thanks Rich, I didn't know that about matt and epoxy, I just went ahead
> and
> > did it.
> >   That repair was about 3 years ago, so I'll start looking for it to
> fall
> off
> > sometime soon.
> >
> > Regards Russ Pfeiffer
> >
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