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I’m spray painting a piece of metal that will get heavy usage from people touching it and cleaning it with harsh chemicals. It’s about 3”x5”. I’ve already spray painted it with a metal primer and then a combination primer/grey gloss color from Rustoleum. Is it necessary to add another layer like a clear coat? If so what can i use from Rustoleum or Krylon? Can i use a automotive spray clear coat from Duplicolor that i have laying around?