Using Wafer Heater in Dusty, Damp, or Demanding Settings

https://heating-elements.publishlane.com/posts/how-kapton-heater-works-and-where-it-fits-in-modern-equipment

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 wafer heater works best when these parts are planned together