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From: "Steve Brooks" <steve@tsisp.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Mogas issues
Date: Wed, 12 May 2004 07:35:27 -0400
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I used the Jeffco 9700 on my Cozy MKIV fuel tanks.  I just painted the stuff
on with a brush.  As I remember I gave it a couple of coats.  I agree that
it would not be good for doing layups.  First of all, it's too thick to wet
out good, and also as you mentioned the gray color would mask imperfections.

Also, be careful with the stuff. Have good ventilation, and don't get any on
your skin.  I wore rubber gloves, but got some on my arm while doing the
tanks.  It caused a pretty good rash, even though I wiped it off pretty
quick.  I had used MGS epoxy and West systems, and never had any problems
with irritation.

Steve Brooks
Cozy MKIV
13BT

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Marvin Kaye
Sent: Tuesday, May 11, 2004 11:55 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Mogas issues


Ernest Christley <echristley@nc.rr.com> wrote:

  > > > The epoxy is advertised as a fuel tank liner.  Could it be used for
the actual
layups of the tank sides and baffles? < < <


Hi Ernest,

No, I doubt that you'd want to use this as a laminating epoxy.... first off,
I
don't know what its structural characteristics are, second, it would be
really
tough to see air bubbles and other possible problems with the layups with an
opaque pigmented epoxy, and finally, it's a pretty viscous material...
getting
adequate wet-outs would be a real chore.  Lancair has been supplying Jeffco
1307LV as its structural resin for a number of years, it has been well
tested
and is factory approved with 2 different hardeners... 3102 (15 minute) &
3156
(30 minute).  I personally use Jeffco 3179 (45 minute) hardener during the
heat of summer and especially for large layups... it has superior structural
characteristics compared to both of the factory-approved hardeners, and is a
much lower viscosity material, which makes wet-outs happen a bit quicker.

Anyway, the method of application that most of my Lancair pals use with the
9700 tank sealer is to squeegee on the first coat to fill pinholes, then
roll
on the second.  The stuff smells bad, but thumbs its figurative nose at
gasoline.  It definitely works well.  Lots of folks also paint the floor of
the fuselage and the upward-facing surfaces of the gear wells as a barrier
against possible damage from hydraulic fluid spills.

   <Marv>

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