Motor Coater does not need to be heat cured. Motor Coater is simply cured by ambient air.
If you want to speed the cure of Motor Coater, you can heat cycle it which means put the painted piece in the sun for an hour and then in the shade for an hour and repeat. This is not required, but it can speed the cure of Motor Coater if that is desired. Please only do this after an initial break-in cure time period of 12 hours.
Please check out the complete Motor Coater Application Directions before you begin your project.