Dear Priyal Narola, generally this achieved through the use of wetting promoters additives such as low MW siloxanes and surfactants, in addition to the spray process which gives the thinnest possible coat. Also if you search for 'drag reduction techniques' you may extend you vision to a broad spectrum of idees. Please check the following documents. My Regards

DOI: 10.5772/56173

https://doi.org/10.1080/00405000.2016.1180951

Dear Priyal Narola, generally this achieved through the use of wetting promoters additives such as low MW siloxanes and surfactants, in addition to the spray process which gives the thinnest possible coat. Also if you search for 'drag reduction techniques' you may extend you vision to a broad spectrum of idees. Please check the following documents. My Regards

DOI: 10.5772/56173

https://doi.org/10.1080/00405000.2016.1180951

Dear P Narola

you can use swift heavy ion irradiation technique of high or low energy ion beam for reducing the surface roughness of your film.

Regards

Thermal spray of CNT/Fullerene can be adopted on the surface.

Priyal Narola

I'd be thinking powder coating where the stoving process produces a very flat surface.