Use in airtight stoves and fireplace inserts. Spray-on product used to produce cleaner burning of woodstoves and fireplace inserts. Modifies creosote by changing it from a sticky tar like material to a loose powdery non-adhering deposit that can be brushed. Helps keep fire residues off glass surfaces, but do not spray on the glass. When used as directed, will not harm catalytic converters. Not harmful if overused. Heat activated.