[captrb]

I used a propane grill and it was very, very effective. I removed the grates and (if I recall correctly) rested the pan on the heat deflection sheets. I left all burners on for about 2 1/2 hours. After cooling, the previous coating was reduced to a thin dust. After blowing it off, the pan was gun metal grey.

I then used a cheap corded drill and inexpensive flap wheels and similar attachments from the hardware store to make it smooth, wearing an N95 mask to protect my lungs.