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Fuel tank

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mjpienaar(at)shaw.ca
Guest

Posted: Tue Jan 12, 2010 6:46 pm Post subject: Fuel tank

Hi All

  

 What brand of epoxy is recommended for sealing the  inside of the fuel tanks

  

 Thanks

  

 Mike

   [quote][b]

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Tue Jan 12, 2010 8:34 pm Post subject: Fuel tank

1/12/2010



Hello Mike, Here is my recommendation:



http://www.aircraftspruce.com/catalog/appages/jeffcotank.php



Please let me know if you go that way and I'll try to dig up some 

application info for you.



'OC' Says: "The best investment we can make is the effort to gather and 

understand knowledge."



===============================================



---

sstearns2(at)yahoo.com
Guest

Posted: Tue Jan 12, 2010 9:18 pm Post subject: Fuel tank

I used the Jeffco stuff in aircraft spruce.  I squeeged in on then painted on two coats  The factory airplanes just squeeged on normal epoxy.  If I did it again I'd probably just use the normal epoxy and really work it in with a squeege.  Maybe add a little flox.  The jeffco stuff does make the insides of the tanks look nice through the fuel cap.

  

 Scott



--- On Tue, 1/12/10, Mike Pienaar <mjpienaar(at)shaw.ca> wrote:



  	  Quote: 	
		  

From: Mike Pienaar <mjpienaar(at)shaw.ca>

Subject: Fuel tank

To: "KISBUILDERS" <kis-list(at)matronics.com>

Date: Tuesday, January 12, 2010, 6:34 PM



    Hi All

  

 What brand of epoxy is recommended for sealing the inside of the fuel tanks

  

 Thanks

  

 Mike

 	  Quote: 	
		  



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et=_blank>http://forums.matronics.com

llow target=_blank>http://www.matronics.com/contribution



	


	


         [quote][b]

76papa(at)dishmail.net
Guest

Posted: Wed Jan 13, 2010 3:53 am Post subject: Fuel tank

Is epoxy impervious to avgas, or is Jeffco better?  Can Jeffco be somehow applied over epoxy in sealed tanks (sloshed maybe)?



Al



On Jan 13, 2010, at 12:13 AM, Scott Stearns wrote:

 	  Quote: 	
		  I used the Jeffco stuff in aircraft spruce.  I squeeged in on then painted on two coats  The factory airplanes just squeeged on normal epoxy.  If I did it again I'd probably just use the normal epoxy and really work it in with a squeege.  Maybe add a little flox.  The jeffco stuff does make the insides of the tanks look nice through the fuel cap.

  

 Scott



	






 [quote][b]

wschertz(at)comcast.net
Guest

Posted: Wed Jan 13, 2010 6:13 am Post subject: Fuel tank

Jeffco is too thick for sloshing.

 Bill Schertz

KIS Cruiser  #4045

N343BS

Phase I testing

  



  From: Alfred Rosa (76papa(at)dishmail.net) 

 Sent: Wednesday, January 13, 2010 5:50 AM

 To: kis-list(at)matronics.com (kis-list(at)matronics.com) 

 Subject: Re: Fuel tank

 



Is epoxy impervious to avgas, or is Jeffco better?  Can  Jeffco be somehow applied over epoxy in sealed tanks (sloshed maybe)?  



 Al

 



 

  On Jan 13, 2010, at 12:13 AM, Scott Stearns wrote:

  	  Quote: 	
		                               I used the Jeffco stuff in aircraft spruce.  I squeeged in on          then painted on two coats  The factory airplanes just squeeged on          normal epoxy.  If I did it again I'd probably just use the normal          epoxy and really work it in with a squeege.  Maybe add a little          flox.  The jeffco stuff does make the insides of the tanks look          nice through the fuel cap.

          

         Scott



	




 

[quote]



href="http://www.matronics.com/Navigator?KIS-List">http://www.matronics.com/Navigator?KIS-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/c

[b]

sstearns2(at)yahoo.com
Guest

Posted: Wed Jan 13, 2010 9:43 am Post subject: Fuel tank

Are you talking about sealing the tanks before closing the wings or sloshing them after they're closed?

  

 Scott



--- On Tue, 1/12/10, Mike Pienaar <mjpienaar(at)shaw.ca> wrote:



  	  Quote: 	
		  

From: Mike Pienaar <mjpienaar(at)shaw.ca>

Subject: Fuel tank

To: "KISBUILDERS" <kis-list(at)matronics.com>

Date: Tuesday, January 12, 2010, 6:34 PM



    Hi All

  

 What brand of epoxy is recommended for sealing the inside of the fuel tanks

  

 Thanks

  

 Mike

 	  Quote: 	
		  



=nofollow target=_blank>http://www.matronics.com/Navigator?KIS-List

et=_blank>http://forums.matronics.com

llow target=_blank>http://www.matronics.com/contribution



	


	


         [quote][b]

sstearns2(at)yahoo.com
Guest

Posted: Wed Jan 13, 2010 9:51 am Post subject: Fuel tank

Jeffco advertises that it's impervious to avgas.  I doubt the epoxy makers would vow to that. 

  

 When I was at Scaled they had done tests of epoxy laminates that had been sitting in jars of 100LL for years.  The final test was at 10 years if I remember right and there was no reduction in properties.  Of course all epoxies are not excatly the same, but it bodes well.

  

 Ethanol in Mogas is a disatster though.

  

 Scott



--- On Wed, 1/13/10, Alfred Rosa <76papa(at)dishmail.net> wrote:



  	  Quote: 	
		  

From: Alfred Rosa <76papa(at)dishmail.net>

Subject: Re: Fuel tank

To: kis-list(at)matronics.com

Date: Wednesday, January 13, 2010, 3:50 AM



 Is epoxy impervious to avgas, or is Jeffco better?  Can Jeffco be somehow applied over epoxy in sealed tanks (sloshed maybe)? 



 Al

 



 

  On Jan 13, 2010, at 12:13 AM, Scott Stearns wrote:

  	  Quote: 	
		       I used the Jeffco stuff in aircraft spruce.  I squeeged in on then painted on two coats  The factory airplanes just squeeged on normal epoxy.  If I did it again I'd probably just use the normal epoxy and really work it in with a squeege.  Maybe add a little flox.  The jeffco stuff does make the insides of the tanks look nice through the fuel cap.

  

 Scott



	




 

 	  Quote: 	
		  



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et=_blank>http://forums.matronics.com

llow target=_blank>http://www.matronics.com/contribution



	


	


           [quote][b]

mjpienaar(at)shaw.ca
Guest

Posted: Wed Jan 13, 2010 10:23 am Post subject: Fuel tank

Hi 

  

 I'm thinking of cutting a hole in each bay and then  resealing from the inside and then repairing the hole again.

  

 The reference that OC gave 

 

http://wiki.velocityxl.com/index.php?title=Jeffco_Fuel_Tank_Sealer

  

 says

  

 

 "Do not apply over old epoxies or other previously applied  coatings. "

  

 I cannot get hold of Jeffco, there is no Jeffco website and the phone  number that is listed in the yellow pages is non existent. so if anybody has a  number for Jeffco I would appreciate it

  

 Thanks

  

 Mike

 [quote]   ---

wschertz(at)comcast.net
Guest

Posted: Wed Jan 13, 2010 10:44 am Post subject: Fuel tank

My invoice from 1998 has 619-576-9900 

  

Jeffco Products 

5252 Kearny Villa Way 

San Diego, CA 92123 



---

mjpienaar(at)shaw.ca
Guest

Posted: Wed Jan 13, 2010 11:19 am Post subject: Fuel tank

Thanks Bill,

  

 I have now tracked them down, they have been taken  over by Rhino products and are distributed by Composites One which means you  cannot get hold of anybody that knows anything, I've submitted a question  on-line so will see what they say.

  

 Thanks for the help

  

 Mike

 [quote]   ---

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Wed Jan 13, 2010 11:19 am Post subject: Fuel tank

1/13/2010



Hello Mike, You quoted:  "Do not apply over old epoxies or other previously 

applied coatings. "



I think that you have to view that as written by some lawyer. Obviously, if 

there is a primer or base coating on the substrate that is not properly 

adhered then any further coating will also be not be properly adhered to the 

substrate.



Realize that our KIS moldings have been made from pre impregnated (with 

epoxy) fiber glass. So all of us that have successfully used Jeffco 9700 FCR 

on the interior of our wing fuel tanks have, in effect, applied the Jeffco 

9700 FCR over a previously applied coating.



Some of us have even applied additional laminating resin over the interior 

surface before applying the Jeffco 9700 FCR.



'OC' Says: "The best investment we can make is the effort to gather and 

understand knowledge."



=============================================



---

mjpienaar(at)shaw.ca
Guest

Posted: Wed Jan 13, 2010 6:32 pm Post subject: Fuel tank

Hi All,



Found my leak to-day quite by accident. In desperation I covered the entire 

wing with dishwashing liquid where I thought the leak could be (that should 

give you a clue). Nothing.



While I was hosing the wing down to get rid of the soap I noticed bubbles at 

the end of the front spar, 4 inches from the tank. Air was travelling 

through the foam core of the spar and exiting at the end.



The question now is do I open the tank and re-coat it inside or do I live 

with gas soaked foam in the spar, all comments will be appreciated. My 

initial feeling is to live with the situation as the major surgery involved 

to cut each bay open and reclose it may be worse



Thanks for the help



Mike

---

Robert Reed

Joined: 22 Oct 2009
Posts: 331
Location: Dallas/Ft.Worth

Posted: Wed Jan 13, 2010 7:13 pm Post subject: Fuel tank

Mike,

  

 If you look on my website you will find that I had the exact same problem with my wing when I was checking for leaks.  I have some photos of the bubbles at the end of the rear spar section.  I cleaned out the corner from the end of the spar back to the rib.  I also dug back into the point of junction between rib and spar.  I sanded and cleaned the entire area and then filled and coated everything with Jeffco 9700 including the rib face and rear spar facing.  As far as I can determine the leaks have all been closed now.

  

 Bob Reed

 

 

 

   From: Mike Pienaar <mjpienaar(at)shaw.ca>

To: kis-list(at)matronics.com

Sent: Wed, January 13, 2010 8:31:51 PM

Subject: Re: Fuel tank



--> KIS-List message posted by: "Mike Pienaar" <mjpienaar(at)shaw.ca (mjpienaar(at)shaw.ca)>



Hi All,



Found my leak to-day quite by accident. In desperation I covered the entire wing with dishwashing liquid where I thought the leak could be (that should give you a clue). Nothing.



While I was hosing the wing down to get rid of the soap I noticed bubbles at the end of the front spar, 4 inches from the tank. Air was travelling through the foam core of the spar and exiting at the end.



The question now is do I open the tank and  re-coat it inside or do I live with gas soaked foam in the spar, all comments will be appreciated. My initial feeling is to live with the situation as the major surgery involved to cut each bay open and reclose it may be worse



Thanks for the help



Mike

---

mjpienaar(at)shaw.ca
Guest

Posted: Wed Jan 13, 2010 8:25 pm Post subject: Fuel tank

Thanks Bob,

  

 I've looked on your site under My Progress:wings:  leak testing: but the photo's don't load. Am I in the right place.

  

 Thanks for the help

  

 Mike

 [quote]   ---

mjpienaar(at)shaw.ca
Guest

Posted: Wed Jan 20, 2010 9:09 pm Post subject: Fuel Tank

Thanks for all the help. I hollowed out the foam  core in the front rib as far as I could and filled it with flox and put negative  pressure on the tank. That cured the problem, held the vacuum for more than 3  days.

  

 I decided not to open the tank to look for the  place where it leaks into the spar on the inside of the tank

  

 Regards

  

 Mike

   [quote][b]

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