1st coat of making something maple look like something brown.
In my Fuji spray gun I mixed precisely a bunch or walnut brown and a bunch of mahogany aniline dye powder in a bunch of clear water based polyurethane. Shook it up, sprayed a bit.
Like my spray booth? Tarps everywhere with a box fan covered with a furnace filter to blow the fumes outside. Mind you, there wasn’t a lot of fumes since I was using water based poly.