Rich, I am re-bedding all my hardware with butyl right now. I am even considering redoing the plexi deadlights on it (of course ideas like that are why the refit is taking so long ) I cannot possibly think of a product that would be easier to use. The size that Mainsail offers is perfect because you can use it on the smallest application or layer for larger ones. Get some, you will never pick up a cartridge gun again.