Building Custom Smoker - need recomendations for paint and coating

Hello Smokers!
I'm building my own smoker/BBQ pit and would like to learn more about best coatings or paints that can handle the HEAT.

I've seen that Crisco is a good aaplication for the fire box,  but also have seen that high heat paint for the lower temp chambers might be the best. I'd like to know how I can roll this all up for the best practice.

I have a sandblaster and plan on cleaning the metal down to sound metal,


Any help and recomendations will be greatly appreciated!!

Thanking all in advance,

Chris