After 8 days of curing time I poored some fuel in them for testing for leaks. The good news is that there is no more leaks. The bad news is ===the sealant that we put inside the tank doesn't seem to hold on the aluminium and detach itseld at some place. That will be a potential source of problem that I don't want.
I've decided to open both tanks by drilling and punching every rivets that hold the top skin, clean the interior and close it back with good sealant. A few weeks delay before the final inspection.
