Picked up some stuff to work on my smoker and noticed the home center had the Grapho-Glass stove "ropes". I was going to pick some up, but in two places, the instructions say "keep away from food". Does this just mean the food shouldn't touch the Grapho-Glass (no prob) or is the "rope" putting out some sort of chemical? I'd like to seal things up, but would prefer not to develop a third arm. Anyone have any experience with this?