Rust removal via chemical means

TSP and water rinse, air dry. Mixed my TSP 1/4 cup to 1/2 gallon tap wate. The hood latch is still unpainted 2 days later . No rust. I live in a pretty dry environment though. I may leave that part without enamel clearcoat and see how long it takes to start flash rusting. I can always dunk it back in the tank lol.