How to Maintain Polyimide Heater for Stable Day-to-Day Heating
https://thin-film-thermal.cavandoragh.org/improving-thermal-efficiency-with-the-right-ito-glass-heater-setup
Many heating problems look like a power problem at first. In practice, the cause may be contact, heat loss, sensor position, or poor fit. A polyimide heater works best when these parts are planned together