Most of the time, what it comes down to is what your customer wants aesthetically. Perhaps they need a rusty looking finish, or a rough texture, or an extra something to make the part stand out from the crowd. It is usually driven by the customer needing a specific aesthetic, or designers aiming for particular looks. However, the need for a special effect could also come from the need to hide a substrate surface that doesn’t look good. This is the main functional reason for using them.
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