Quick building question

[patterndude at attbi.com]

Leave it on, Steve.  It's on an external surface and it is thin so it should 
cure.  Don't know what kind of epoxy you used, because there are brands that 
seem to work quite well and others that are much harder to work with.

Next time you come visit us, ask these questions live!!!  Save you much 
gnashing.
--Lance
> Ok guys.  I did one side (bottom) thinned just a bit, and the other side
> (top) with the epoxy strait (it's 30 min) and it spread just fine.  So the
> question is this...Should I bother to rip the glass off the bottom side and
> redo it, or just live with it?  I kinda figured that the bond we're looking
> for here is for side load, so it may not be too big of an issue.
> 
> Thoughts?
> 
> Thanks again,
> Steve
> 
> ----- Original Message -----
> From: "wgalligan" <wgalligan at cnbcom.net>
> To: <discussion at nsrca.org>
> Sent: Wednesday, May 07, 2003 5:18 PM
> Subject: Re: Quick building question
> 
> 
> > I'm with "U" PatternDUDE!!!!
> > I have experienced the shrinking qualities of the epoxy in some fill areas
> of a now departed airplane that was thinned with alcohol.   If it was
> shrinking in a fill area imagine what would happen in a critical area like a
> joint or in the glass seam... could it shrink enough to pull on the center
> joint casueing problems... I dont know but I wouldnt want to find out.
> > WG
> >

> >  Hey epoxy cutters,
> > > This may be obvious, but I've seen some statements that can be
> misleading.
> > > When anything is added to epoxy, it either evaporates out or stays in
> the
> > > mix.  When you add alcohol or acetone to epoxy the mixture will be
> thinner,
> > > but these solvents will severely weaken the epoxy.  When we paint it on
> balsa
> > > (as in glassing wings) the solvent evaporates off, but if you use
> thinned
> > > epoxy on other applications (where the epoxy is inside a joint) the
> solvent
> > > molecules will be bound into the epoxy matrix and the result will be
> weaker
> > > epoxy.
> > >
> > > You can prove this by leaving the epoxy/alcohol mix 1/4 inch deep in
> your
> > > epoxy mixing cup.  When you come back the next day, it will be cured,but
> > > rubbery.
> > >
> > > The best way to get thin epoxy is to start with a thin epoxy.  Don't
> start
> > > with thick epoxy, unless you don't care about strength.
> > >
> > > --Lance
> > > > Use denatured alcohol (ethanol) to cut epoxy and be real careful how

> much
> > > > you use.  Usually a few drops will thin it down a lot, and adding it
> will
> > > > take the cure time from whatever it might have been to overnight or
> longer.
> > > > You can buy it at Walmart in 1 quart cans.
> > > >
> > > > Adding acetone may thin epoxy, but it will attack foam.  The only
> thing I
> > > > use it to thin is Aerogloss Dope.
> > > >
> > > > ----------
> > > > From: Bill Mears <bill at mears.com>
> > > > To: discussion at nsrca.org
> > > > Subject: Re: Quick building question
> > > > Date: Wed, May 7, 2003, 9:54 AM
> > > >
> > > >
> > > > Can  acetone ne used to cut epoxy ?
> > > >
> > > > Terry Brox wrote:
> > > > The view was certainly proof of that  LOL
> > > > ----- Original Message -----
> > > > From: "wgalligan" <wgalligan at cnbcom.net> <mailto:wgalligan at cnbcom.net>
> > > > To: <discussion at nsrca.org> <mailto:discussion at nsrca.org>
> > > > Sent: Wednesday, May 07, 2003 9:12 AM
> > > > Subject: Re: Quick building question
> > > >
> > > >
> > > >
> > > > I think he os leaning more towards the "something" thing.

> > > > WG
> > > >
> > > >  > Are you an epoxy expert or something?  LOL
> > > >
> > >
> > > > BTW, Your new contest mate sure has a cute, um, shoe. LOL
> > > >   ----- Original Message -----
> > > >   From: Gray E Fowler
> > > >   To: discussion at nsrca.org <mailto:discussion at nsrca.org>
> > > >   Sent: Wednesday, May 07, 2003 8:41 AM
> > > >   Subject: Re: Quick building question
> > > >
> > > >
> > > >
> > > >   Steve- Rubbing alcohol is a mixture of isopropyl and and water.
> Water
> > > >
> > > > bad. Epoxy hate water.......Plus amines (the epoxy hardener) really do
> >
> > > >
> > > > not dissolve well in isopropyl. You are better off with methanol or >
> > > > denatured alcohol which is ethanol with a nasty taste killer so you >
> won't
> > > > drink untaxed alcohol.I do not know what epoxy you are using, but >
> that
> > > > center reinforcement is easy without cutting the viscosity. Bring > it
> to my
> > > > house I have lots of low viscosity resins.
> > > >
> > > >
> > > >
> > > >   Gray Fowler
> > > >   Principal Chemical Engineer

> > > >   Composites Engineering
> > > >
> > > >
> > > >        "Steve Barlow" <stevebarlow at attbi.com>
> <mailto:stevebarlow at attbi.com>
> > > >         Sent by: discussion-request at nsrca.org
> > > > <mailto:discussion-request at nsrca.org>
> > >
> > > >         05/06/2003 10:10 PM
> > > >         Please respond to discussion
> > > >
> > > >
> > > >                 To:        <discussion at nsrca.org>
> > > > <mailto:discussion at nsrca.org>
> > > >                 cc:
> > > >                 Subject:        Quick building question
> > > >
> > > >
> > > >
> > > >   Guys,
> > > >
> > > >   I'm doing the fiberglass reinforcement over the balsa sheeting where
> >
> > > >
> > > > the main wings are joined on a .60 size kit.  Can I use rubbing
> alcohol > to
> > > > cut the epoxy with to thin it just a bit?  Do you think that would >
> cause
> > > > me any problems?  It sure would make it easier.
> > > >
> > > >   Thanks,
> > > >   Steve
> > > >
> > > >
> > > >
> > > > =====================================

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