Rear glass install - butyl tape vs urethane

Discussion in 'Body Restoration' started by Allison Winn, May 9, 2021.

  1. Allison Winn

    Allison Winn Red70Z

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    I had my 1970 rear glass professionally installed. The guys super cleaned everything, used correct pinchweld primer, used 3/8 butyl ribbon, set the glass and all was good.

    Then I started working on setting the trunk lid and filler gaps and such. In doing so I removed the 2 small spacer blocks and forgot to put them back in. Over the next week the glass "slid" down until it is touching the filler panel and completely off the upper pinchweld butyl tape. YEP it came off the butyl completely and like it was never stuck. No residue on the glass and the exposed butyl isn't even sticky.

    So I am rethinking the re install. Has anyone used the special modern urethane glass adhesive on old school cars?
     
  2. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Yes, urethane can be used on our Camaros.

    It’s not a “DIY” project.

    Make sure the trim fits properly before the urethane sets up.
     
  3. COPO

    COPO Veteran Member Lifetime Gold Member

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    When I had butyl both my front and rear windows sunk and left a large gap between the glass and trim.
    In ‘85 I had both front and rear glass done in urethane. Both glass’s have not moved. Don’t use butyl.
     
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  4. badazz81z28

    badazz81z28 Veteran Member

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    If they used Butyl, it was not professionally installed...lol.

    The OEM from the factory did in fact use urethane to install the front and rear glass. GM did not use butyl on 2nd gen camaros.
     
  5. RickM

    RickM Veteran Member

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    ^^^^
    Correct in my 81 Fischer body manual it clearly states that urethane is what should be used, front and back.
     
  6. secondgenaddict

    secondgenaddict Veteran Member

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    The glass should have been cleaned and should have the primer applied to it as well, that is probably why it slid... however as stated Butyl was only used for a strip about 6-8" long bridging the area where the antenna lead comes from the center of the glass.
     
  7. badazz81z28

    badazz81z28 Veteran Member

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    My 70 03B car still has the original rear glass, secured with cured urethane.
     
  8. G72Zed

    G72Zed Veteran Member

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    No, it was not professionally installed. Your "rethinking" is correct.

    Get a true Pro the next time, the windshield is part of the vehicles overall structural rigidity and design, same as the rear to a point, and not a point to cut corners in any way.
     

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