The corrosion is right where water would collect and sit. to prevent this, i am going to drill a drain hole so it doesn't sit in water again. Is there a recommendation of how to place the tank into a bridal? Maybe put a thin piece of starboard down first so it's not sitting directly on the fiberglass?We are reading through and discussing Everett Collier's book, 'The Boatowner's Guide to Corrosion". Sailboat Owner's Guide to Corrosion - Basic Theories (Collier 1-4)
There are descriptions of spot corrosion in fuel tanks and such that result from poor, chipped or worn paint jobs or contact with bilge water and another metal. There is probably an underlying problem that needs to be addressed, not just a fuel tank that needs repair.
I think most of the other participants in the corrosion thread feel aluminum is a poor choice for fuel tanks.