Polished Centerline Auto Drag 4 inch pattern Wheel Re-Furbish

Was Gifted a set of 4" pattern 15x8.5 with 4.5 backspace late last year to replace my 3.75 backspace rims of the same size.

My Re-Polishing efforts are near complete. I was wondering if anyone had resealed the split area and how they did it! The originals just look like a Silicon bead but cleanly applied.

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I would think cleaning the area and applying a good quality silicone should do the trick.