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Stainless steel grades 410, 420 and 440 – martensitic stainless steels. This type of stainless steel is magnetic primarily because it contains large quantities of ferrite in its chemical composition, which is a compound of iron and other elements.

I think it would be interesting to see if these rust spots are happening to trucks that get wrapped. Maybe someone who gets a clear wrap could comment?

I think 'keying' would cause damage to the wraps everyone is getting, rather than to the SS. I wonder whether it would be possible to run something similar to a taser thru the SS. Should be safe as long as the wrap is intact, but try to key the vehicle thru the wrap, and ZAP!