Just BS: Thanks for the advice. Sand blasting up here is pricey. I called a few places and they want around $60, depending on the joint.
Funugy: I am going with the food grade. I was trying to avoid the burn but I don't think it can be helped. I've heard of people putting in those long burning logs and letting it go to town. I figure it should keep the fire under control. Since it was food grade, you think that would be good enough?