Apply no thicker than 1/4 inch per application. It is better to apply one thick coat instead of multiple thin coats. The application must air dry for at least 24 hours. It must then be heat cured (before applying a second coat). 

To heat cure: Hi-Temp Lab-metal must be heat hardened by exposing it to a temperature of 425ºF for one hour. Heat hardening must be completed prior to powder coating.