I've not removed undercoating so I can't speak about the ease of removal but I have seen what too much heat can do to a panel. A propane torch is quite hot & can get too much heat into a panel quickly. It sounds like you're being careful. Just don't get in a hurry. How do you feel about trying a heat gun or high output hair dryer instead?


Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.