Troubleshooting Slow Heat-Up in a Kapton Heater System

https://thin-film-heating.clarionvale.com/posts/how-watt-density-affects-silicone-heater-performance

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