Refractory paints are designed to display good thermal resistance, as well as excellent corrosion and mechanical properties in service. The present work investigates the corrosion and mechanical performance of SiC-based refractory paints. Refractory paints containing varying amounts of silicon carbide (β-SiC) along with alkali inorganic binders were used. The alkali activator used was an aqueous solution of NaOH/Na2SiO3, with metakaolin used as the aluminosilicate material. Five samples with varying proportions of β-SiC particles of varying size fraction were used to prepare the bimodal β-SiC. The samples used were 100% micron, 70% micron + 30% nano, 50% micron + 50% nano, 30% micron + 70% nano, and 100% nano-SiC as the aggregate, and this was mixed with the binder and then applied on nickel-based super alloy (Inconel 738) and then cured at 80 °C for 24 h and then exposed to 1100 °C for 8 h. Abrasion, corrosion, and electrochemical tests were used to determine the properties of the coating. The analyses showed that by increasing the proportion of nano-SiC, the porosity decreased which in turn helped to enhance the corrosion and abrasion resistance.