I have come into a number of stainless tanks(mostly Kellys) with soldered seams. Is it a foregone conclusion that they are lead contaminated or is that questionable? If they are lead contaminated, can they be remediated inexpensively? Are they just scrap? Someone spray painted over the seams on some of them. I am looking to hear what folks have to say. If they are scrap, Oh well, but it's a pity to scrap such a pricey item if it can be satisfactorily reworked..