I'm working on a 68 C10.

Looking for what sealant material is used to seal the glass into the "vent & door" window channels? So far what I have found is something called "Setting Tape" having various sizes. Also have found a "Butyl Tape also various sizes. That being said the material used (various thicknesses) along with the glass and channel sizes leaves the glass "loose" whether using OEM or aftermarket glass, the math doesn't work. What was originally used is a form fitting type of material that isn't anywhere found.

Any and all Help or Links is very much appreciated.
Thanks, MJ

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