What sealant to use around skylight? March 13, 2025 at 12:41 pm #42783 IA_CamperParticipant Joined: Jan 2024 Posts: 165 Likes: 173LikeUp1::I came to say dicor self leveling myself. I used it a few years back around a vent and havent had any issues since. I DID remove the old caulk but it was so bad I felt i had too.