REFLECTOR: Flox question, (epoxy bonds)

[John Dibble]

Larry,

I doubt that sanding or peel-ply breaks any significant amount of chemical bonds to
have a measurable effect.  If that did happen, you would have the same starting
materials - liquid resin and hardener - that you started with.  I think what they do
do is 1) increase the surface area, and 2) create tiny crevasses that produce an
interlocking effect when filled with the layup epoxy.

John

Laurence Coen wrote:

> The chemical bond is called cross-linking. If you do a lay-up over cured
> epoxy there will be no cross-linking which is an absolute no-no.  If you
> sand the cured epoxy or use peel-ply you break some bonds in the cured epoxy
> and they become available for cross-linking to the next lay-up so they are
> chemically bonded.  Done correctly either method will produce a chemical
> bond.
>
> Larry Coen
> N136LC (Still in one piece).
>
> --------------------------------------------------
> From: "Matt Bucko" <mbuc310 at cox.net>
> Sent: Sunday, May 11, 2008 12:12 PM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Flox question
>
> > Thanks. The chem bond maked sense.
> > Matt
> >
> > -----Original Message-----
> > From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> > Behalf Of Andy Millin
> > Sent: Sunday, May 11, 2008 3:34 AM
> > To: 'Velocity Aircraft Owners and Builders list'
> > Subject: Re: REFLECTOR: Flox question
> >
> >
> > Hey Matt,
> >
> > Yes, you can do it as you describe.
> >
> > As you describe it, you will have a Mechanical Bond.  I think that is the
> > right term.  Think of it as two pieces that are glued together.
> >
> > If you did it all in one step, then you will have a Chemical Bond (not
> > sure
> > of terminology).  This way you have one piece.  I believe it is stronger
> > this way.  I would do it this way.
> >
> > FWIW,
> >
> > Andy
> >
> >
> >
> > -----Original Message-----
> > From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> > Behalf Of Matt Bucko
> > Sent: Saturday, May 10, 2008 11:22 PM
> > To: Velocity Aircraft Owners and Builders list
> > Subject: REFLECTOR: Flox question
> >
> >
> > I am going to put in layup B on the wing/winglet joint. I will be running
> > 2
> > beads of flox before I put the lay up on. One bead on each part, outside
> > edge.  Any reason I cannot let the flox cure, sand and then apply the
> > glass?
> > Or should I apply the glass layup to wet flox, with the foam slurried?
> >
> > Matt
> >
> > _______________________________________________
> > To change your email address, visit
> > http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery!  www.tvbf.org/gallery
> > user:pw = tvbf:jamaicangoose
> > Check new archives: www.tvbf.org/pipermail
> > Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> >
> >
> > _______________________________________________
> > To change your email address, visit
> > http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery!  www.tvbf.org/gallery
> > user:pw = tvbf:jamaicangoose
> > Check new archives: www.tvbf.org/pipermail
> > Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> >
> > _______________________________________________
> > To change your email address, visit
> > http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery!  www.tvbf.org/gallery
> > user:pw = tvbf:jamaicangoose
> > Check new archives: www.tvbf.org/pipermail
> > Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> >
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html