Looking for advice on stopping or removing rust on my '99 GMC Sierra doors.
The rust is on the inside at the bottom between the inner shell and the outer door skin flange. My first attempt was sand blasting the area, applying rust converter, and then topping it with rust encapsulator. The rust came back, and I'm thinking it's because I removed any rust for the converter to grab onto. I'm wondering if I should try and unfold the door skin lip with the door skin remover pliers you sell, or will that damage the outer door skin? OR what would be the proper process to chemically stop the rust?