I finally decided to get rid of the dry rotted carpet on my 1950 cadillac series 61 sedan. I knew the floors were rotted but now I cant believe Ive been driving it around for a year like this. Somebody pop riveted on some aluminum sheet to cover the "bad spots". Its really all bad. Swiss cheese. I have been messing around MIG welding for about a year and Im pretty comfortable with welding and grinding. This will be my first time welding on a car and doing a floor replacement. I could use some guidance. Firstly, after pulling up the carpet and foam, theres this kind of tar paper glued down everywhere. Looks to be original from the factory. Most peels up pretty easily but it does leave a gluey tarry residue. Any reccomendations to remove it? I was thinking of putting a wire wheel on the angle grinder and going to town. Secondly, the base of where the inner and outer rockers meet is toasted and pretty much gone. What order would you approach this? Rockers first so I have fresh metal for the floors? I will try and post pics but its hard from a phone, it frequently says the image is too large to upload. Thanks in advance.