Applying more heat in time and/or temperature than is required for cure. Overbake is the result of curing powder coat at too high of a combination of time and/or temperature. The film often becomes too hard and may embrittle also causing the gloss level or color to be adversely affected. Many powders have overbake for time protection built-in allowing a powder to cure double the allotted cure time. This is especially important for curing substrates with varying thickness. Overbake protection does not apply for too high of temperature.