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Do your very best to request that your butcher give you a piece of meat that has not been touched or trimmed, if at all possible.
If you must buy it outside of the processor packaging, when you get home prepare a clean surface with either kitchen parchment or foil. Run tap water over the surface of the meat (after washing your hands thoroughly, of course ). Rest the meat on the prepared surface. This will have rinsed off many potential contaminants, but more importantly, it will provide the moist surface that is critical for good UMAi Dry® membrane bond.
UMAi Dry is not a vacuum bag and requires a very moist meet surface to create a good bond.