I have removed the rust from my '68 Evinrude "Mate" gas tank and rebuilt the filler neck with JB Weld. I would like to coat the interior with something that would be impervious to gas and oil. I am going to all this trouble out of necessity; I am having a hard time locating another tank. With the new manual, I have completely restored this little motor with the tank as my last problem. Does anyone know of an interior coating for old tanks?