Question:   Hi Bill, 1:  Can your patinas be applied to steel that has been polished to a extremely smooth surface? 2:  Can a patina surface be polished with jewelers rouge? How much would Mig welding/plasma cutting affect a patina? 3:  And, what is the shelf life of the mixed copper patina?  (COPPER F/X™ Steel … Continue reading Steel Patinas – Shelf Life