Troubleshooting Slow Warm-Up in Kapton Heater

https://thin-heaters.evergrovio.com/posts/installing-a-polyimide-heater-practical-steps-for-better-heat-transfer

A kapton heater can solve a simple problem: place useful heat close to a part that needs it. The best result comes from a clear plan. Shape, power, contact, and control all affect the final behavior