I don’t think that using the same supplier but a different coating would satisfy the dual source requirement. Using a different coating might not be as useful and productive because each coating has a different set of properties. These properties dictate the behavior of the coating over time. They might last a different amount of years, be used for different types of devices, or simply are affected by different external factors. For example, a coating for a catheter definitely has different properties from a coating of a medical scissor. I believe that in order for the dual source requirement to be satisfied, the coating must be very similar to the one that was agreed upon. If the original company doesn’t have one that is similar, then the requirement can’t be satisfied.