66 outer heater box to firewall sealer - NCRS Discussion Boards

66 outer heater box to firewall sealer

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  • Robert P.
    Very Frequent User
    • October 19, 2019
    • 300

    66 outer heater box to firewall sealer

    what is the most correct sealer that is available now that can be used between the outer heater box and the firewall
    thanks for any info
    Bob Peckham 66450
  • Gary S.
    Super Moderator
    • February 1, 1984
    • 456

    #2
    Re: 66 outer heater box to firewall sealer

    Flex Seal....this has been suggested before on the forum.

    FirewallWireGrommetArea copy 2.jpgFirewallSealerTest copy.jpgFirewallSealerTest2 copy.jpg
    Avatar--My first ever vette, owned 3X since 1977, restored 1993-2024. Top Flight Award 9/14/24

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    • Mark M.
      Very Frequent User
      • October 21, 2008
      • 333

      #3
      Re: 66 outer heater box to firewall sealer

      There's a product called submarine sealer which I believe is made for ac systems. In the qt. can red and white label. It looks brown when applied but turns dark when dry. Other members suggested it to me years ago and it worked well.

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