Later pics are clearer. OK, once again, wash it with degreaser and then contact cleaner. It has to be clean AND dry/oil free. Get some Loctite 'Super Wick-in' and dribble it along what looks like the flaw. Leave it a few hours and repeat. Then once more. Heat the area with a heat gun or blowtorch, don't overheat it, just get it warm. Allow to cool then apply epoxy over and around the flaw. Allow to set for a day or two. Take it for a good flog and see if its stopped it. If it has? Paint it.