Leaks around windshield gasket

Today I squeezed this black stuff under the gasket where it meets the metal, per CUUDAK's instructions. Messy and hard to know how much got in there, and it dries pretty quick. I pressed down on it firmly to (hopefully) get a good seal. I was able to coax the gasket outward quite a bit but there's still a gap as pics show. My question is should I fill in the gap with the acrylic goop? Thanks for your suggestions.

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