The proper procedure for the 68-70 B body windshield install is: Apply a full 1/4" thick bead of window sealant (NOT SILICONE!) along the entire lower channel where the gasket sits, then apply a 1/4" bead from the lower corner of the A pillar opening up along the A pillar channel about 12" high on both A pillar channels, immediately install the gasket, and windshield, do not allow the sealant anytime to set up, start the windshield install at the bottom, work both sides up simultaneously into the gasket, then work each upper corner towards the center simultaneously. do not put any sealant in the gasket lip where the glass fits into

Mike