usually, and I only own a few carbon pans, u want many layers of VERY THINK layers of oil, vs 1 thick, since the goal for it to become bonded with metal, where as thick oil will never bond as strongly as thinnest possible layer, so most likely you would need to remove it all and re-season. perhaps it does adequate job keeping it from rusting during shipment, but def not good enough, imo, for actual seasoning..
I believe and don't quote me, once other cast iron makers do the pans, they tumble them through sand or pebbles, which would round off edges and remove other crap that came from casting...