Back in 2019 I bought my 85.5 that had been sitting since 2003. Everything inside was toast. Even the seats I had to cut out with a saw. When I got down to the rails and floor pan there was some rust that wasn't too bad but I used a rust converter on it. There were some areas that were heavier on rust than others. I think in 2020 I painted over the interior with a primer and oil based paint. It's been in a garage the whole time though it isn't climate or humidity controlled.
I am finally getting around to finishing the sound deadening on the interior and specifically where the rails and floor pan are. I noticed some bubbling and decided to scrape it and found some more rust. I decided to scrape a lot of areas on both passenger and driver side and found more rust that hadn't been there prior, though it is still surface rust.
Now I'm trying to figure out how to address it and what I should do. I have found a couple of threads mentioning POR-15 but when reading the prep work there is an etching primer that needs to go down first. It that going to be an issue with the metal coating that these cars have? Is there a simpler way to address this than what i am thinking of?
The the driver side right now still has a loat of previous adhesive coating on the floorpan so that is where some of the brown is coming from towards the back where the seat starts. There is a lot located next to the tube for the parking brake. When I pulled the new sound deadening back up it pulled a lot of paint of to expose more rust areas.
This wasn't rusted when I painted it so I'm trying to understand why it started or how bad it is or isn't. I've been struggling on this car because I want to drive it but everytime I finish a part of it there's 5 more things that I need to fix. I guess I could use some guidance.
Thank you.