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I have done many,I feel the best adhesive to use is is primerless quick cure urethane,it comes in a tube style cartridge dispensed with a caulking gun,if you use the short cut method which is favored by most autoglass installers then the idea is to cut the w/s out leaving as much butyl on the pinchweld as possible.next you will lay a 1/4" bead of urethane all the way around across the top of the butyl and then lay on the w/s pressing firmly around the perimeter(there should be two rubber setting blocks along the bottom of the frame aprox 4" inward from each side,these will keep the w/s from sliding down while waiting for the sealant to dry,if you have no setting blocks then you will need to keep the w/s in place with blue painters tape.ureathane is also great for holding the trim on.
If you want to use butyl it works ok but you need to remove all the old butyl and yes you do need a primer made for butyl it comes in a can with a brush applicator,over lap the new butyl at the bottom and do not touch the contact surface of the butyl because that can cause leaks.
just my two cents,good luck
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