Betaprime will work fine,
clean the pinch weld,
prime pinch weld and allow to dry,
do not prime glass just clean and dry well(keep in mind new razor blades will not scratch glass)
do not run the butyl too close to inside edge of pinchweld or you may end up with sticky edges inside the car when you are done,
as extra security against leaks you may wish to apply autoglass silicone around the perimeter of the glass after setting it and then tool it up to the glass edge,
if there are any drain holes along the bottom of pinchweld do not fill them in,
if you choose to use silicone make sure that it is for autoglass use.A lot of silicone products have an acid base to help with adhesion,over time these non autoglass silicones will remove the paint from the surface causing rust and leaks.