It'll smoke like crazy. Have you though about doing it on the barbecue?
If you have it all cleaned up, then just use it. Bake on it every day for a week and the fat or oil or butter that you use will seep in and bake on too....
When dealing with seasoned cast iron, if the seasoning gets cracked and pitted, it can be removed by getting the pot / pan really hot (glowing) and just brushing it off with a wire brush.....
Santaman2000, in the UK a girdle (Scotland and N. England) or griddle is, also knows as a bakestone. It's the flat iron plate that was used to bake on over an open fire; nowadays we just put them on top of the cooker; electric, gas or aga/raeburn.
There must be a million recipes for cooking on them
I'm presuming you're more familiar with the wriggly iron plate used for searing meat ?
atb,
M