F9 Rust Remover Ques??

I have a customer looking for me to paint her metal railings

Normally, i would hit this with a wire brush to remove most rust (labor intensive)

Can i spray some F9 to remove without impacting the painting afterwards? I would think so , just want to verify

View attachment 28524

Mike, I tried it (F9) on metal and it didn't work.
 
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