Windshields Leaking

[Kisner]

Any glass experts out there? I finished restoring my 68 coupe this past winter and in the process me and a buddy installed both my front and rear windshields. I had a video showing exactly how to install both and we followed it exactly. Unfortunately, we installed the molding and didn't water test at that time (wanted to wait until spring to test, wash, and wax the new paint). Well, water tested yesterday and both are leaking. Front windshield leaks pretty bad only at bottom passenger-side corner and back glass leaks slightly at both bottom corners. Any advice? Water's coming in under dash at right corner and slightly dripping in trunk at both corners but can't tell from it's coming from. Should I remove molding and add more sealant. Was told at the time to use (which we did) the butyl-based black bedding and glazing compound (black gooee stuff). We packed it in on the gasket around the glass (too much - had bit of a clean-up) and after was installed packed it in around the edges. Any advice greatly appreciated. Thanks.