If the substrate is metal, I sand blast it when possible or use 80 grit emery paper as a second choice.
如果基板是金属，如可能我就喷砂或者，作为第二选择80粒度的金刚砂纸。
Stiff paper coated with powdered emery or sand.
覆有金刚砂粉末或沙的硬纸。
Fine sand cloth or emery cloth may also be used with the same precautions.
细砂布或金刚砂布也可以使用，但同样要小心。
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