You always need to polish your parts before you plate them. The condition of the part before you plate it, dictates how it will look after you've plated it.
You really need to be sure which metal you have before you try a plating process, or you could have very bad results. For example, if you think you have a piece of aluminum and you try to copper plate it using our copper plating kit, but the part is really pot metal, your part will likely dissolve away in the acidic copper solution.
I suggest you post a problem report in our PRS system if you continue to have problems.
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