REFLECTOR: Jeffco spec sheet

Wed Mar 21 18:56:11 CDT 2012

OK thanks Chris.  

A couple of days ago I placed a piece of strake cut-off (inner skin + foam + outer skin) into a tub of mogas w/ethanol. When I put the lid on, within 30 sec the pressure built up in the tub. Is perhaps the foam and something in the gas combining to give off a noxious gas? And could it be the noxious gas that's the culprit in damaging the Jeffco and other components???

I have since punched 2 holes in the lid of the plastic tub and added another piece like the 1st but with Jeffco on one face. The Jeffco is face down in the mogas. I will add a 3rd piece with jeffco, but this time face up to see if it is affected differently then the one that is face down. Is my experiment not valid because I'm using a plastic tub?

Tom

On Mar 21, 2012, at 3:56 PM, Chris Barber <cbarber at texasattorney.net> wrote:

> I had mogas from across the street. I am running a rotary, so it was the choice. However, there is only speculation that the mogas, with up to 10% ethanol, was the culprit. Yes, it very well may be, but with the evidence we have we could flimsy as easily speculate it was a bad batch of Jeffco. I am hopping to provide data points and not judgment. 
> 
> Sent from my iPhone 4
> 
> On Mar 21, 2012, at 12:50 PM, "Tom Falls" <tomfalls6 at gmail.com> wrote:
> 
>> Chris,
>> What did you have in the fuel tanks to cause the flaking of the Jeffco?
>> 
>> Thanks,
>> Tom
>> 
>> Sent from my iPad
>> 
>> On Mar 21, 2012, at 11:32 AM, Chris Barber <cbarber at texasattorney.net> wrote:
>> 
>>> We never found a smoking gun. Much speculation tho. At the time, about every question was asked. I also sent a sample if the flaked off Jeffco to Velo but they were left scratching their collective heads. We questioned prep but myself and the buddy who was helping me at the time are certain we were meticulous in are prep and application process. I don't usually make absolute statements like that either. I qualify damn near everything...see, just like this sentence. Perhaps pinholes allowed seepage. Perhaps pollen in the air that day, or dryer lint or, or, or .....
>>> 
>>> I chose Jeffco to minimize concerns. It didn't work out that way. It was what seemed to be the conventional wisdom at the time, especially since when it was first applied I was still speculating about engines. The diseil Deltagawk was even a consideration. 
>>> 
>>> Following the failure and consultations and others input, including Gary Hunter (epoxy guru and Bruce Bohanons crew chief) came to the conclusion that EZ-84 was likely the most fuel (and whatever else may be in it) resistant. 
>>> 
>>> Heck, when my mind wonders, I daydream about a solution such as painstakingly lining the fuel strakes with thin metal. Sigh. 
>>> 
>>> Chris 
>>> 
>>> Sent from my iPhone 4
>>> 
>>> On Mar 21, 2012, at 9:47 AM, "Peter Braswell" <peter.braswell at gmail.com> wrote:
>>> 
>>>> Chris,
>>>> I've got a lot of time and money invested in Jeffco and I'm just about ready to close out the strakes.  Is the flaking / failure of your Jeffco the result of exposing to mogas or ????
>>>> 
>>>> Best,
>>>> Peter
>>>> 
>>>> ------------------------------------------------------------------------
>>>> "It's a Jungle Up There": www.zuluworks.com
>>>> Great Aviation Gear: www.sky-gadgets.com
>>>> ------------------------------------------------------------------------
>>>> 
>>>> 
>>>> 
>>>> On Wed, Mar 21, 2012 at 10:35 AM, Chris Barber <cbarber at texasattorney.net> wrote:
>>>> I originally used Jeffco and had complete failure in both strakes. It chipped off in small sheets. I had to almost completely rebuild my strakes. I was not flying yet (still not but may be very close). This was a few years ago. I rebuilt with just EZ-84 (I have a five gallon kit of Jeffco if anyone is interested). I put in several test strips of the EZ-84 with the mogas I have been using back then and as of two weeks ago the test strips appeared perfect. Just some data points. 
>>>> 
>>>> Chris Barber
>>>> Houston
>>>> 
>>>> Sent from my iPhone 4
>>>> 
>>>> On Mar 20, 2012, at 6:00 PM, "John Dibble" <aminetech at bluefrog.com> wrote:
>>>> 
>>>>> There's a very thin light grey coat.  Kinda looks like primer overspray.  There's numerous scratches in it and quarter sized bare spots at the bottom.  Underneath it is a light olive color, similar to other unpainted areas.
>>>>> 
>>>>> John
>>>>> 
>>>>> On 3/20/2012 1:44 PM, Laurence Coen wrote:
>>>>>> 
>>>>>> John,
>>>>>>  
>>>>>> Jeffco is light grey and EZpoxy is dark tan or light brown.
>>>>>>  
>>>>>> Larry Coen
>>>>>> N136LC
>>>>>> 
>>>>>> From: John Dibble
>>>>>> Sent: Tuesday, March 20, 2012 12:55 PM
>>>>>> To: Velocity Aircraft Owners and Builders list
>>>>>> Subject: Re: REFLECTOR: Jeffco spec sheet
>>>>>> 
>>>>>> I was thinking a better product was needed.  Sounds like we already had one.  Is there a way I can tell what was used in my tank?
>>>>>> 
>>>>>> John
>>>>>> 
>>>>>> On 3/20/2012 11:01 AM, Laurence Coen wrote:
>>>>>>> 
>>>>>>> I find it interesting that the spec sheet, under surface preparation, says not to apply over epoxy coatings.... like the inside of a Velocity fuel tank.  I built my tanks prior to Jeffco becoming the thing to do.  I used 4 coats of EZpoxy and no problems 7 years of 100 LL later.  I did not check EZpoxy with mogas but I did test it with denatured alcohol which is ethyl and methyl alcohol plus acetone.  A scrap in a two month soak test showed no physical changes in it's properties that I could detect.
>>>>>>>  
>>>>>>> Larry Coen
>>>>>>> N136LC
>>>>>>> 
>>>>>>> From: Tom Falls
>>>>>>> Sent: Sunday, March 18, 2012 8:28 PM
>>>>>>> To: 'Velocity Aircraft Owners and Builders list'
>>>>>>> Subject: REFLECTOR: Jeffco spec sheet
>>>>>>> 
>>>>>>> Attached is the spec sheet for the coating I received from A/S when I ordered “Jeffco” about a year ago.
>>>>>>> 
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