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Basically, you have to find the extent of the damage, cut it out and replace it with healthy metal. Here's a brief article on how it's done. It's not cheap but if done properly you shouldn't have to worry about it again in your lifetime.
I did a frame on rust proof.I sand blasted just about all the frame from underneath and the wheels off and then rust proof it and painted it,15 years ago and its still holding up.only took a whole weekend ,if you have everything you will need ,like blaster,compresser,nozzle,etc.Its a dirty job,real dirty,but worth it.My car is garaged and only goes out on sunny,non rainy days.So im able to keep the frame in good shape,i still need to do the wind shield frame.
You will have to take the molding off to see the extent of the rust and while your there take the dash out and kick panels. This will give you an idea , but to really see what you have the windshield has to come out. I had the same problem as you every time I hit a bump in my 70 it snowed rust. So one Sat I took the dash and all the molding off including the stainless. Turned out all I needed to replace was the upper windshield frame and the corners .
Hi MMH,
I agree that you need to do some disassembly to see just what's going on. That could well take a weekend or 2.
I believe I'd remove the exterior SS trim and interior soft trim on the A-pillar, remove the passenger's side dash pad, drop the driver's side pad by unscrewing it and dropping the steering column, and remove the kick panel on each side.
All this work will allow you to get a pretty good look at the rust situation.
A 69 is a pretty nice and valuable car and you don't want to let it continue to rust away.
Regards,
Alan
I was going to do a frame ON resto. I then realized I wasn't going to get the results I wanted so I decided to remove the body and I have to say it was definitely the right decision for doing a restoration. It made it so much easier. I removed it with a 2 ton engine crane.
It took 3 years to the month and I mean I worked on it every day even if it was for a couple of hours after work.