Originally Posted by
Marty Paulus
3M 5200 is a below the waterline marine grade sealant/adhesive. I use it for my boats all the time when bedding fittings there is nothing better. However I am more inclined to recommend epoxy in this case. It is stronger and I believe more UV resistant. Expoy will cure in about 24 hours. 5200 takes up to a week to fully cure. If you do go with the 5200 look at the big orange box. They seem to have the best prices on that item. The marinas, at least by me, are a few $$ more per tube and may not be as fresh.