C2 Rear Window installation
Is it better to butyl tape or use urethane adhesive with spacers to install the rear window? Anyone tried either method?
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Re: C2 Rear Window installation
Definitely use the rubber spacers when setting the rear window. IF you don't the chrome trim will not fit correctly. Many years ago I had a "professional" reinstall my back glass after a repaint. He left out the spacers and the chrome never fit correctly. A couple of years ago I did a Frame off. I re-installed the glass myself using the spacers. Amazing the chrome fit correctly.... so much for the "professional". I used the roll of adhesive with a primer. -
Re: C2 Rear Window installation
Greg,
if you are going to have the car judged you will have to use the original butyl tape. If you use urethane you can tell the difference once installed.
RichComment
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Re: C2 Rear Window installation
Although many midyear rear windows have been replaced or re-installed over the years using butyl tape, GM never used that material. In production, both the body opening flange and the corresponding area on the glass were coated with a Silane primer (one for paint, a different one for glass), two different sizes of spacers were applied to the body opening flange to place the glass at the proper height in the opening for correct fit of the reveal moldings to the glass surface, then a bead of pumpable Thiokol adhesive was applied to the glass, and the glass was set in the opening and bottomed against the spacers.
This is exactly the same process that was used for '68-up windshields, except they also used a fabric-reinforced "dam" on the glass inboard of the adhesive bead to keep adhesive squeeze-out from being visible past the edges of the interior garnish moldings. The pumpable Thiokol adhesive was replaced by the urethane adhesive at some point in the 70's; same material that's used today.Comment
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