x2 on the epoxy primer. It lasts almost indefinitely, and adheres so well it can be used as a base for body filler. About 10 years ago I blasted most of my frame and brush painted it with POR-15. Subsequently I discovered Zero Rust, which I now like better. The POR is hard as a rock, and great unless it chips. I have little rust pits popping out all over my chassis, many years after it was applied. I did some Zero Rust pieces about the same time, and those remain rust free. You can Google a number of links doing comparisons. The other nice thing about Zero Rust is it does not have isocynates, so it doesn't present the same level of health risk.
The Eastwood rust encapsulator is also a fantastic product. I used it on the bottom of my 46 Ford sedan about 25 years ago before Eastwood bought the rights and put their label on it. I applied the encapsulator to the bare metal, and painted over it with catalyzed enamel. 8 years and 300,000 miles later the bottom of the floor remained in perfect condition.
