Quick question about windshields (front and back) and butyl

Ok I read a few threads on installing windshields. I know the front most people apply the seal to the body first then start working in the glass. What my question is when should the butyl come into play. I bought two tubes of butyl for a caulking gun. Which in my head would of been an easier application. Should I apply butyl to the pinch weld first then seal then glass? Or butyl seal then mount seal then glass?

Also what steps should I take with the rear..

Working on a 69 Dart hardtop thanks.