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Technical Epoxy That Gasoline Wont Dissolve - Is There Such a Thing

Discussion in 'The Hokey Ass Message Board' started by Oldmics, Jul 15, 2019.

  1. Looking to see if anybody has come across an epoxy that wont break down and dissolve for long term useage.

    Dont really want to use JB Weld for sealing a carburator but probably will have to consider it also.

    Any suggestions ?

  2. Truck64
    Joined: Oct 18, 2015
    Posts: 3,179

    from Ioway

    Not much will hold up to gasoline long term, JB-Weld is good stuff, but it won't last very long. If there is something that works, it's probably banned or hard to source. I've used cyanoacrylate aka superglue to seal the gasket to powervalves.
  3. buzz4041
    Joined: Nov 14, 2008
    Posts: 218

    from Texas

    Belzona is what we use in the plants.
    jimmy six likes this.
  4. gnichols
    Joined: Mar 6, 2008
    Posts: 10,433

    from Tampa, FL

    I know it is available in the aviation world, but can't provide a brand or part nr, sorry.
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  5. Casey Riley
    Joined: Jun 27, 2018
    Posts: 354

    Casey Riley

    I've used it on derby cars a bunch of times. It is gas proof.[​IMG]
  6. Hemiman 426
    Joined: Apr 7, 2011
    Posts: 444

    Hemiman 426
    from Tulsa, Ok.

    Are you talking about 1422 sealant with the 776 topcoat?? works with JetA
  7. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 8,959

    Rusty O'Toole

    Caswell makes an epoxy gas tank sealer. I used it on a car 10 years ago and it is still standing up.

    Seal All works, I used it years ago. There are brands of epoxy putty made for fixing leaks in gas tanks, I think Loctite makes one but there are others. Any auto parts store should have them.
  8. X2. Also used it on derby cars

    Sent from my iPhone using H.A.M.B.
    Casey Riley likes this.
  9. Atwater Mike
    Joined: May 31, 2002
    Posts: 9,513

    Atwater Mike

    Only thing I ever saw that was specific to gasoline resistance was a product called 'Kopeltite'. It was used on the heavy cruiser U.S. Los Angeles, for gasoline fittings.
    Friend brought a bottle off the ship when he was discharged, 1961.
    Best gasoline fitting sealant I've ever used.
    Due to availability, I'll go X3 on the SealAll.
    jimmy six likes this.
  10. leon bee
    Joined: Mar 15, 2017
    Posts: 287

    leon bee
    from Arkansas!

    That Caswell Rusty mentions is the stuff, but you gotta buy $50 worth of it. If not more. And that seal all works on fittings, etc., where nothing else will.
  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 5,136

    Bandit Billy

    Had a hole in a gas tank once in the middle of no where. The old guy at the gas station told me to chew up a tootsie roll and stick it in the hole. Held for years. Haven't ate a tootsie roll since.
    williebill, jim snow, Jet96 and 7 others like this.
  12. alchemy
    Joined: Sep 27, 2002
    Posts: 13,861


    I wouldn’t eat it either. Especially after it’s been on the bottom of a gas tank for years.
    williebill, jim snow, Jet96 and 9 others like this.
  13. I had a hole in the swap meet gas tank I picked up for my old Deuce pickup, I tried JB Weld and it wrked for a while but the gas started leaking again within a few weeks, I wouldn't suggest it. HRP
    jim snow likes this.
  14. You ain't right. :rolleyes: HRP
  15. papa's 39 koop
    Joined: Apr 20, 2011
    Posts: 161

    papa's 39 koop

    I had same problem in my 55.. couple of old farmers at the station told me to rub a bar of ivory soap across the leak . It sealed it up and never leaked again .Drove it another 3-4 yrs before I sold it. Always kept a bar in my tool box ...
  16. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,364

    jimmy six

    Kopeltite and Belzona were used in every power plant I ever worked. Belzona could be applied under water...salt water included.
    lothiandon1940 likes this.
  17. Pats55
    Joined: Apr 29, 2013
    Posts: 188

    from NJ

    Gasoline won't touch my stuff
  18. Truck64
    Joined: Oct 18, 2015
    Posts: 3,179

    from Ioway

    I've heard bar soap will seal smaller holes, never tried it though.
  19. onetrickpony
    Joined: Sep 21, 2010
    Posts: 357

    from Texas

    I always used regular slow dry epoxy to seal the well plugs on the bottom of Quadrajets that are so prone to leaking. I never had any issue with gasoline softening it. I usually heat-cured it for an hour or so with a heat lamp to speed up drying.

    The local fire department carried epoxy ribbon with them on their trucks to seal leaking gas tanks at accident scenes.
    deathrowdave likes this.
  20. catdad49
    Joined: Sep 25, 2005
    Posts: 3,301


    May be he's not Right, but sure made me chuckle!
    OLSKOOL57, jim snow, blowby and 2 others like this.
  21. Atwater Mike
    Joined: May 31, 2002
    Posts: 9,513

    Atwater Mike

    Yes also on the bar of Ivory soap! Always on threads, pipe or male/inverted.
    Used it on my 4 jugger 304" flathead.
    Bonus: Cleanest carbs in town...:p
    Jet96, lothiandon1940 and Frankie47 like this.
  22. harpo1313
    Joined: Jan 4, 2008
    Posts: 1,600

    from wareham,ma

    Marine tex
    Randall likes this.
  23. Roger O'Dell
    Joined: Jan 21, 2008
    Posts: 1,022

    Roger O'Dell

    If your talking parting surfaces HYLOMAR, my first use was used for component surfaces on the Rolls-Royce rb211 the Lockheed L-1011 powerplant. They didn’t use gaskets. If for a crack good luck.
  24. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 1,336

    from illinois

    There's a big difference between gasoline " proof" and gasoline " resistant" , and there's a difference between " exposed " to and " immersed " in...
    VANDENPLAS likes this.
  25. Mike VV
    Joined: Sep 28, 2010
    Posts: 1,477

    Mike VV
    from SoCal

    For cheap stuff, JB Weld works fine. I used it on a carburetor fuel line fitting that the threads were eaten away. No leaks for 3 years, then changed engines.
    Actually better than their gas tank repair material.

    If you want a real sealer -
    A-788 Splash Zone Compound.
    The pro engine builders use this for repairing filling heads and intake manifolds. I've used it for fixing intake manifolds that were altered to work on a different engine that they were originally designed for.
    Not cheap, works great with gas and alcohol..!

    lothiandon1940 likes this.
  26. rockable
    Joined: Dec 21, 2009
    Posts: 2,582


    lothiandon1940 and Truck64 like this.
  27. JB Weld has a specific product that is supposed to be gas proof/resistant
  28. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,364

    jimmy six

    JB Weld is in 2 of my intake manifolds and have all kinds of fuel in them with nothing ever happening..
  29. My experience is if it can stand full immersion in gas, the mechanical strength is lacking so trying to fix a broken internal part is an exercise in futility. Most will work as a sealer as long as the whole joint isn't fully immersed.
    Joined: Jul 20, 2006
    Posts: 1,762


    Every Quadra jet carb I overhauled I coated the main jet wells on the bottom side with j-b weld and had no problems with it being dissolved with the gas
    lothiandon1940 likes this.

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