What do you think of the potential for TG counts to unmask treatment arm?
Blue painters tape, make it as close to what you want the caulk line to look like as possible, apply caulk and smooth until you can see edge of tape (this takes some practice to get just right), then immediately remove tape. Pull away at a very sharp angle to bead. Don't let set up too long otherwise caulk will adhere to tape. Use wet rag to wipe excess off fingers if acrylic or dry if 100% silicone.