It’s always nice to know the material… tile comes in many varieties, such as porcelain/ceramic, slate, granite, glass and metal.
These are created by @bulldog with his 60W fiber. It should be able to be done with a 20W machine, just a bit slower…
Can you clarify what you are doing a bit? What do you mean by superficial? What do you mean using powder pain?
What are you doing that requires them to be painted?