There is a guy that does powder coating but does it matter if it on the inside of the lid as well?I've never seen anyone primer for "heat spray paint" so I don't think that's necessary. If you decide to go two cans, wait a couple days before painting with the second can.
If power coating is available near you, you might look into that. It costs a little, but well worth the price of admission
Could try powder coating it yourself and simply use the heat of the grill itself to set the paint
It won't make any difference, the downside is that all that nice powder coating on the inside will get all smokey / greasy. The outside will be amazing, and very easy to keep cleanThere is a guy that does powder coating but does it matter if it on the inside of the lid as well?
I suggest that you rethink that idea. That paint is only rated for 550 degrees. These grills can get that high. I would not use anything not rated for closer to 1000 degrees. While the lid thermometer may read 500, there will be areas that can get much higher so you need some buffer.
This is the stuff I used on the grill pictured above.
If you check amazon, you will find several colors using search: "Rust-Oleum High Heat automotive"
Here is a nice "BLUE" color. Still only 900 degrees, but should be plenty for the Q grill lid.