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Liquids are usually just for corrosion removal. Pastes should contain a mild abrasive. You know how buffing required SOME pressure. This time, when you use sand paper, do it with almost no pressure....

What you want to have is a metal polish in a paste form. If your current polish is a liquid, then you need a paste, if it's a paste, then don't worry about it, BUT... Go back to 1000 and go gently...