Cost-effective and durable thermal insulation paint capable of reducing temperature by ~22-25 ⁰C in the temperature range of 135-150 ⁰C has been developed for aerospace application. The coating has been tested under simulated conditions with a mass flow rate of 1.6 kg/s. It has qualified stringent thermal shock and weathering tests as per ASTM standards. The paint is a room temperature formulation, that is sprayable and is easily scalable. It has compatibility with Al and composite structures.