Ceramic insulators have been in use for overhead transmission lines for many decades and have proven their long life. Though the performance of ceramic insulators is excellent under dry conditions, they deteriorate under polluted conditions, leading to pollution-induced flashover. One popular technique to mitigate this problem is to coat the surface of the ceramic insulator with Room temperature vulcanized (RTV) silicone rubber coating. From the literature, it is seen that adding nanofillers to RTV will improve its electrical thermal, and mechanical properties. In the present work, Zinc Oxide (ZnO) nanomaterials were prepared in the laboratory using the solution combustion method. The XRD diffraction was performed on the prepared fillers to realize their phase formation in the nano range. The fillers were added to the RTV base in different weight percentages to form nanocomposites. Water absorption tests have been performed on these nanocomposites to check their affinity to water. These nanocomposites were coated onto the ceramic insulating specimens and were subjected to heavy pollution. These polluted specimens were placed inside the fog chamber and flashover tests were carried out. From the flashover test results, the performance of 1ZNRTV specimen is found to be superior in comparison with other specimens. From water absorption test results, it can also be seen that 1ZnRTV to be absorbing less water indicating the reason for its improved performance under polluted conditions. From the studies, it can be concluded that RTV with a suitable concentration of nano ZnO additives can be seen as an alternate solution for the pollution problem of ceramic insulators.