Not only will coatings on metal potentially prevent a spark, but if you are able to create an arc and weld, it may result in weaker or unattractive weld results. Heat and paint strippers may also be used, including acetone, but they must be cleared and dry before weld. Sandpaper and angle grinders can be used to strip down to the bare metal. You will want to remove this coating from both the work piece and the clamp connections to ensure a strong electrical circuit.
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