Ive only used butyl when replacing a windshield on a older car and thats been a while to be honest. I believe you may want to check out 3M Seam Sealer Caulking Strip or 3M Seam Sealer Tape. Its possible though that the glass has shifted and that is what is causing this gap. Hopefully the dealer can diagnose this (one way or another) without charging you.
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