Suitable multilayer coatings may have a thickness in the range of about 10 ??m or more, e.g. to about 200 ??m, including all values and increments therein, such as 25 ??m to about 100 ??m, as measured by SEM. The total time period required to achieve such thicknesses may be about 2 hours or more, e.g. up to 12 hours, including all values and increments therein, such as 6 hours to 8 hours.