We have a mango, hull # 46 from 1985 and the same cracks... i plan to use a dremmel and open it up a little, then do a standard gelcoat repair with west epoxy fairing compound and paint with awlgrip primer and paint and and see how they do....I personally love the teak deck look so I dont plan to remove it. I habe seen a Davids mango hull number 44 I believe where the PO removed the teak look and it came out looking great...so that is always a backup plan for us...