In my perpetual list of things to fix on my boat, I need to repair my punctured mast from last season. I have found an aluminum welder in the area that said he could fix it, however, he needs to know the type of alloy used in the mast extrusion so he can make sure he has something that will not only bend around the curve of the mast, but something that will mate with it and not crack when cooling down.

Anyone know off the top of their heads.. or will I have to give Alter a ring?