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On treating rust;
The best way is to dip in an acid bath, rinse, dry and immediately coat with a direct to metal sealer/primer.
My 66 was sandblasted and the project went on hold for a few months, I noticed several areas that were turning black from rust. After a few months I purchased a product called ospho which is also an acid based chemical and treated all of the bare metal. After the treatrment the car was sanded using 80 grit with a DA sander. Then I sprayed the car with a high quality DTM primer and started the body work.
Good luck,
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