Here is a video and instructions . Hope this helps.
https://www.hometalk.com/diy/repair/garage-doors/how-to-add-a-seal-and-insulation-to-your-garage-door-38827894
https://www.houselogic.com/organize-maintain/diy-repair/how-to-insulate-a-garage-door/
https://www.youtube.com/watch?v=RML2ID4QVDs
https://www.youtube.com/watch?v=zhHOBxy3WaE
https://www.youtube.com/watch?v=OROTrjn1j9E
I used an electric bread knife. It worked great
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Here is a video and instructions . Hope this helps.
https://www.hometalk.com/diy/repair/garage-doors/how-to-add-a-seal-and-insulation-to-your-garage-door-38827894
How to Add a Seal and Insulation to Your Garage Door
https://www.houselogic.com/organize-maintain/diy-repair/how-to-insulate-a-garage-door/
https://www.youtube.com/watch?v=RML2ID4QVDs
https://www.youtube.com/watch?v=zhHOBxy3WaE
https://www.youtube.com/watch?v=OROTrjn1j9E
I used an electric bread knife. It worked great