A hydrothermal deposition process was explored as a route to deposit a ZrO2 coating for the mitigation of IGSCC in the BWR environment. Since it would be greatly advantageous to conduct deposition at a plant without defueling, a thin resistive coating (say <30 μm) that is still capable of conferring a low ECP would be much more desirable than a thicker one, in order to avoid potentially negative impact on heat transfer. However, only thick coatings (> ~40 μm) were capable of conferring low values of ECP; thin coatings (< ~5 μm) were not. Thinner coatings are more likely to contain defects that allow the environment access to the underlying metal. At the same time, a crack growth-rate test conducted in high-temperature water with 30 ppb sulfate addition, under both NWC and HWC, on a sensitized 304 SS specimen deposited with a thin coating of ZrO2 showed near-identical response to an uncoated specimen.