Not sure if it was here or on another board that I saw this.
But someone build a oven that sat on top of his gas BBQ I don't remember all the details but he did show pix of stuff he had power coated in it and they looked good from the pix...... If I'm not mistaken the power coating is flamable so you have to keep it away from open flame

If I find the post I'll put it up here

MM64