There are some good products on the make to help combat rust. The best for the money are classed as rust converters. 2 name brands are Core Seal & EN-rust. It’s a base coat for raw steel that works great. Just clean the rusted area up best you can by chipping any flake layers and finish up with a wire wheel on a small angle grinder. Apply at least 2 coats of this product and use a galvanized top coat; I like the cold galvanized spray.
After owning and running offshore trawl boats over 10 years and another 10 years on oilfield vessels I tried just about every product on the market to combat rust. Rust converters best way to go.
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