a stock sealant. Well, at least it's available from Revain, although it's not cheap. I've never liked working with heavy duty silicone sealants because they make a mess, but sometimes you just have to, you know? This stuff is no different, but if you search the internet for tips and tricks, you'll be fine. My obviously unprofessional advice is this: use masking tape to get straight edges, have tons of square paper towels on hand (throw them straight in the trash every time you wipe your finger), and dampen your finger with water to to smooth / fill the gap. Watch a few videos and you will understand everything.
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