Mark / Bill,

It's been a while since I researched this but the high strength epoxy Europa uses to bond wing skins etc. was a premo product, but I unsure about how it stands up to alcohol.

Anyone have some info on that?

George (down under)

 

Bill,

My big concern is the bond joint attaching the wing skin to the spar and ribs.  Lancair uses Hysol to bond the honeycomb skin to the ribs during closeout and there is no way to seal the Hysol off from the fuel.  I have seen pictures of where ethanol had attacked the Hysol.  I don't know how long it took or how it was corrected.  So, my main concern is with the Hysol adhesive, not the Jeffco 9700.

 

Mark 

 

On 8/14/08, Bill Schertz <wschertz@comcast.net> wrote:

The Jeffco 9700 FCR data sheet showed that it is supposed to be compatible with gas/alcohol mixes.  One of my fellow builders tested some samples with Jeffco coatings, and Aeropoxy in a mix of gas/15%Alcohol.  The Jeffco coating was intact after the soaking, *but* it did swell some. The Aeropoxy flaked off .

So, any pinholes in the Jeffco, and the underlying aeropoxy would be attacked, leading to a sequential failure as the underlying epoxy was attacked.

Bill Schertz
KIS Cruiser #4045
N343BS
----- Original Message ----- From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, August 13, 2008 1:26 PM
Subject: [FlyRotary] Re: Tank problem with Mogas vs fouled spark plugs

Bill,

Do you still have the container of sealer? If so, why not just look up the product's data sheet or call the manufacturer to see if it's safe for alcohol? IIRC, the stuff that Van has sold in recent years (Flamemaster brand) is alcohol safe. At least, the stuff they shipped to me was. A bigger concern if you used any old aviation style items like gascolators, is the likelihood of natural rubber gaskets in them.

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