gas tank pin hole repair

not sure where best forum is for this question.but will place here. i need to buy new tank for 63 dart(keeper) ,and want to sell the 2 dusters. hate to buy new tank for it as noone seems to want to pay for anyparts put on it!? this car is 72 duster,I pulled tank to repair floor and found several pinholes in upper left corner, i know, buy a new one!!! lol,.. years ago i did bandage repair with material from auto parts store. any recommendations?? i realize it rusts from inside also but for now just want to seal pinholes there on that outside corner. thanks