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dan mckeeA card that has glue on the back can never be mint, therefore I would always try to soak it off. Unless it is a very expensive card, because you always run the risk of the card soaking apart like my 1952 topps Mantle did. It split into two pieces the top layer and the bottom layer. I had to elmers glue it back together and it is now housed in a SGC 2 holder. I love grading.