REFLECTOR: EZ poxy & ethanol

Fri Jun 3 14:25:23 CDT 2011

I am currently in the process of coating my tanks with Rhino 9700 (formerly
Jeffco ). Although I have no intention of using fuels with ethanol, I do
plan on using 98 octane and 100LL. Attached is the data sheet for Rhino
9700. Under chemical resistance, pure Ethyl Alcohol (Ethanol) is listed with
a 6.9% weight gain after 3 weeks. I don't know if this means a failure or
not . . . . but again it's 100% Ethanol. Any chemical types out there that
can tell us what "% weight gain" really means?

Tom

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Velocity
Sent: Friday, June 03, 2011 2:02 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: EZ poxy & ethanol

I had a very similar experience with pump gas. Melted my optical sump sensor

and pealed the jefco  in the sump. I could not tell you if it was the 

Ethanol because they put so much crap in our gas 

here in Chicago. But some thing in the gas station pump gas 

is not good for our tanks. 

The epoxy was not effected by the gas just the jefco pealed. Makes me
question the Jeffco

Ron

----- Original Message ----- 

From: Alex Balic <mailto:velocity_pilot at verizon.net>  

To: 'Velocity Aircraft Owners and Builders list' <mailto:reflector at tvbf.org>

Sent: Friday, June 03, 2011 11:38 AM

Subject: Re: REFLECTOR: EZ poxy & ethanol

I had a similar problem as Chris- although I did not put any mogas in my
mains, I had my sump filled with 89 pump gas for engine testing, and after
about 6 months, I noticed gas weeping from the bottom- so I  pulled it and
the Jeffco had become soft and pasty- not sure what happened there, I
re-built the sump using a new batch of Jeffco, but have been running on
100ll since just to make sure there is no problem... I will try the auto
fuel again at some point.

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Laurence Coen
Sent: Friday, June 03, 2011 11:16 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: EZ poxy & ethanol

Peter,

You are not the first to warn people about EZ poxy and ethanol and I doubt
that you will be the last.  I refer you to Al Gietzens' email where he has 6
years experiences with ethanol containing fuel in his EZ poxy tanks without
a problem.  I personally tested a strip sealed in a container with denatured
alcohol with no apparent effect after 6 months. Despite all the warnings, I
have never seen or herd of any documented evidence that would indicate that
EZ poxy is adversely affected by ethanol containing fuel.  If you have a
reference, please share it with the group.

Larry Coen

N136LC

From: Peter Braswell <mailto:peter.braswell at gmail.com>  

Sent: Friday, June 03, 2011 10:26 AM

To: Velocity Aircraft Owners and Builders list <mailto:reflector at tvbf.org>  

Subject: Re: REFLECTOR: Fuel Tank Questions

Mark, 

That almost certainly sounds like the EZ poxy that ships with the kit and
NOT Jeffco (the really good stuff).  

My understanding is that the EZ poxy holds up just fine with aviation fuel
but I'd be VERY hesitant to use it in conjunction with fuel containing
ethanol.

I may have missed, but are you flying an auto conversion?

Peter

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On Fri, Jun 3, 2011 at 11:07 AM, Markinchampions <markinchampions at gmail.com>
wrote:

It appears as a dark brownish red color. 

Sent from my iPod.

On Jun 3, 2011, at 10:21 AM, "Al Gietzen" <ALVentures at cox.net> wrote:

I don't know what was used. I didn't build it and I'm not that familiar with
fiberglass. 

EZ-poxy is the epoxy system that Velocity sent with the kits; and is most
likely what was used.  Shine a light in the tank - should be a
yellow/brown/gold color if EZ-poxy, gray if Jeffco.

Al

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