splashwell to transom seal/caulk ?w/pics added in This Old Boat Posted Monday at 05:13 PM I found an old Boat US magazine article about boat sealants and adhesives. The best sealant in your case would be BoatLife, a polysulfide, or 3M 4000 UV, a polyether. 3M 4200 and 5200 are polyurethane construction adhesives and not chemical resistant. On 4/9/2021 at 11:55 AM, line guy said: aluminum boat splashwell needs re sealing, Should I use adhesive type product? Needs to be oil and solvent (gas) compatible. Any recommendation? Removed old caulk and cleaned up with paint thinner.