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Message: <blockquote data-quote="Bob Landry" data-source="post: 364236" data-attributes="member: 7025">Fast cure 5200 would be the sealant of choice. Remove the paint around the opening and clean with alcohol or MEK to remove any residue. Put a liberal amount of sealant around the fitting and have someone on the inside snug the backing nut just until some resistance is felt. Give it a day and give the nut another 1/4 turn. The reason for doing tit his way is so that you don't make it so tight that you squeeze out the sealant.Keep in mind that 5200 is permanent, so if you think you may ever want to remove it, Fast Cure 4200 also is an acceptable sealant for under-water fittings.</blockquote>