I am getting tired of trying different settings for engraving tumblers with different coatings. Some look like they are painted and some with thick coatings. They are all stainless steel internals. Then comes another question, do I use the blue light laser first or Fiber laser first? I know this isn't space science but I'm running out of materials, time and my MIND! I hope anyone can make this easier than what it actually is. This should be fun but it's driving me crazy.