what sealant did the factory use?
Window weld urethane, it sticks to glass, it sticks to rubber, it is black.
Can go around the window rubber with a fine bead. Wear some mechanics Gloves, hard to get off your skin.
Can smooth It in with a wet finger quick before it sets. Can paint after cured if you need to.
Went around my whole '76 D100 windshield to fill in the poor fitting gaps and seal it from any water getting in.