Good info, Whatshis'. This quote from it reinforces what I posted under the restoring cast iron thread.
"2. Brady Allison (1/26/00) sent in her technique for repairing cast iron pans:
"I was perusing your hints and saw the question about cleaning coatings off cast iron. The method I always use for old cast iron (as in having picked up a piece cheap at a yard sale or auction do to crud covering it) is to place it in a fire till the coating burns and turns to ash. Then You can wipe the coating off and season after cool."
Dave, got to disagree with you on puttting in the meat and not touching it. Right after it's been put in, it should be moved around to keep it from sticking. Then leave it alone.
Edit: If you've rubbed the meat with oil before putting it in, this may not be necessary. But, check to make sure it slides.