What the heck is this stuff?!

Discussion in 'Electrical Systems' started by Z20AINT, Apr 9, 2008.

  1. Z20AINT

    Z20AINT Veteran Member

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    I am currently restoring the original engine compartment wiring harness on my 73 camaro. At the firewall connection the terminals are filled with a brown gooey substance to keep out water. I need to reapply this protection as I have removed a lot of this stuff during cleaning. Although, I can not figure out what this stuff is. It is thicker that dielectric grease, is not undercoating, and does not appear to be seam sealer. Does anyone have any idea what this thick brown grease like substance is. HELP!
     
  2. 79camaro2001

    79camaro2001 Veteran Member Lifetime Gold Member

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    cooked on grease?? lol
     
  3. protour73

    protour73 Veteran Member Lifetime Gold Member

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    Contact M&H Electrical, Painless or one of the other wiring harness manufacturers, I'm sure you can purchase it!! It is on my brand new M&H harness, so it's obviously suggested to use.;)
     
  4. Cardinal

    Cardinal Veteran Member Lifetime Gold Member

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    I think it's called Dum Dum. My dad was a electrician and he had it to seal inside conduit.
     
  5. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Different stuff than he's describing.
    Dum Dum is more like modeling clay. The stuff in the bulkhead electrical plug is more like very stiff grease.
    (It gets thicker over the years too.)
    I think it's the same stuff you find in the bottom of the tail light sockets.
     
  6. protour73

    protour73 Veteran Member Lifetime Gold Member

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    From M&H Electrical website FAQ's
     
  7. rgearhead

    rgearhead Veteran Member Lifetime Gold Member

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    kinda reminds me of cosmoline ,,,,,,that gunk they smear on guns for storage ,,
     
  8. rare71

    rare71 Veteran Member

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    It definately has a cosmoline like quality. Garand grease is pretty similar too.
     
  9. Jazn_84

    Jazn_84 Veteran Member Gold Member

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    Deffinatly dielectric grease
     
  10. 79camaro2001

    79camaro2001 Veteran Member Lifetime Gold Member

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    Does it look like this stuff??

    [​IMG]

    I cleaned it out with Mean Green,
    [​IMG]

    I was told it was Dielectric Grease so i put this back in it.

    [​IMG]

    [​IMG]
     

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