If you have the pilot arc torch starting the cut shouldn't be a problem. If you have a standard torch you should have a clean metal starting area but then can go through paint and rust.
Dan
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Units owned
Longevity WeldPro LS200PI (IGBT) welder and Force Cut LP80 plasma cutter, Longevity auto dark welding helmet
Atlas 10x36" lathe
Craftsman 5HP 30 Gal compressor
Home made CNC router/plasma cutting table
Home built aluminum foundry, HF 4x6 bandsaw, O/A torch