Troubleshooting Slow Heat-Up in a Kapton Heater System

https://heating-technology-works.lowescouponn.com/polyimide-heater-installation-guide-for-flat-and-curved-surfaces

In precision instruments, a kapton heater must deliver heat in a controlled way. It uses a resistive foil circuit laminated within polyimide film. One useful trait is custom circuit patterns. Still, hot spots can change the result