It depends. I brush on either Minwax oil-modified, water-based polyurethane (Lowes) or Minwax polycrylic (Home Depot). It depends on whether I want the final finish to have the natural yellow tint of polyu or the blue tint of polyc. I don’t spray any more because I don’t have an effective overspray exhaust system I can do in my condo attached garage shop. I also do a lot of coats pre-CNCing because I’m often painting the grooves, and having a lot of topcoat allows me to be sloppy painting. I can just sand off the slop and the poly protects the layers beneath that.
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