I can only speak for my myself, but I live 3 blocks from the Atlantic ocean on a small island outside of Charleston, where everything outside rusts and usually rusts quickly. When I starting removing the paint from my engine compartment and the rear wheelwells using heat, scrapers and wire wheels. I then treated the bare metal with Eastwoods Fast Etch, a zinc phosphate coating according to directions and did nothing else until I took it to the body shop 2 years later and not a spot of surface rust was present. This stuff worked for me and I will use it whenever I can.
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