When cooking on your glass top stove, it is essential to note that some materials can leave a permanent mark on the glass top. how to protect your glass top stove from Cast iron pans are known to be one of the most common offenders. The metal-on-metal contact can cause permanent scratches on the glass top. It is also possible for this kind of contact to chip or crack the glass top completely. To avoid leaving a permanent mark on your stove, here are seven tips that you can use before cooking with cast iron pans.