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CLEAR COAT NAIL POLISH, just put a coat of this on and let it dry. As long as the pins in the POS are unable to make contact with the chip, it won’t/can’t read it. Then even if you hand the card to the “cashier” they won’t notice anything wrong and they can put the card in and try it.. Now make sure you put the polish only on the chip, and to make sure you clean any excess polish off the card itself..