The "glue" is a roll of urethane adhesive that is placed on the cleaned car surface the windshield sits into. There should be two small "dams" at the bottom, against which the glass will rest to ensure it is placed as it should be. Not too far down, not too far up.
Place the roll of adhesive on the car, then lay the glass on the dams, then rotate the glass down to the rest of the adhesive. Ensuring that it uniformly engages with the adhesive roll. Even using you open hand to press on the glass edge areas. You can usually see the roll flatten out through the glass.
Not a "gasket" in the normal sense of what the Slabs used, but "sealer" and "adhesive" in the services it performs. Which makes that windshield a "glue-in" situation.
Many professional glass installers use the correct caulking-gun type of 3M-brand premium sealer, rather than the pre-formed roll. This sealer is heavy-bodied enough that it will not run, as many of the earlier RTV silicone sealers could.
I suspect there are some YouTube videos on how to install a "glue-in" windshield or back glass. The installers will probably make it look easy, which it can be.
Just some observations,
CBODY67
