Making circuit boards

Answers might be on the “TUBE”, but info is power…and answers might help me. Anyone making circuit boards ready for etching using lasers? Ortur 20 watt (4.5). What is a good coating material for the copper clad boards? What is a good power setting for the laser? Does the laser need an add on lens for fine focused beam to make traces that go in between chip pads? Speed? Thanks.

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