I don't know what the #$%^!@#$ they used for undercoating inside the doors but holy crap was it ever a bear to get off I held the patch panel in on the outside of the fender and traced what I needed for a filler...cut it and installed it...No binding no pressure it just fell right into place... All but one small area that I had to trim with the tiny Dremel wheel... I did manage to clean up the passenger door today and got lucky as it was still pretty solid...
