I have a 63 chevy stepside and need to know how can i get inside the doors to get the rust off. Its eating its way through and if i cant get it gone, my doors are doomed! And would anyone recommend fiberglass for some holes? Not rusty anymore. And how can I get dents out of my bumper? Last thing, I have some huge rust holes on the top of my windshield and if i put fiberglass how will i be able to shape it? Or should i find someone that i can cut out there good piece and weld to mine?