Determine the average elevation of undulating, measure or by the experience. (each machining methods often create a roughness)Choosing the right grain size sandpaper (or approximately) so to Polish Continue to use paper of grain size, finer than sandpaper right after using the right half of the paper type beforeSandpaper, perpendicular to the previous paper ratingUse the add some liquid to create the needed gloss (note the types of steel are list of balls)
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