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I tried using regular candle wax for seals. It doesn't work. The wax hardens too quickly and doesn't cling properly to the paper.
Oh, this is a TERRIFIC idea! I've often had this problem in the past with baking dishes that had no markings to indicate proportions or size. If this works with glass dishes, then I can mark them and stop checking as to what they'll hold when they're full. Will this work on metal pans too or just glass and ceramic?