indy4x
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- Pontypool, South Wales. UK
But our problem is often with rusted nuts and bolts (or other threaded stuff), so you're talking about chemistry along a small crevice down the threads. So, "at the coal face" the citric starts, converting rust to iron citrate, but that has no where to go and acts as a buffer layer, impeding more citric getting to the rust.If it's something that can wait days it gets citric acid as strong as I can make it. Can't be rusted together if the rust has dissolved.