I’m going to still finish it in black or perhaps a very dark brown over the rosewood. No blue. I just want the rosewood grain to show through ever so slightly while obscuring the defects.

The top is going to be sunburst from the back and sides color down to a medium to darker amber in the bridge area. I think a slight amber hue from the zpoxy will work well with that concept and the reddish brown accent woods on the guitar. I’ll make sure to have a well prepared surface to spray the toner on. Does anyone have advice on the mix ratio of dye to finish?

Ben, have you ever done any spray finishing before?

I would suggest doing a few clear finishes before you tackle this. There is a lot to learn using a spray gun the first time in just getting good coats and an even finish. This tinted finish will introduce too many challenges at once. Instead of a learning experience it will be a frustrating experience.

Here are some helpful links.
https://howardguitars.blogspot.com/2015 ... rt_18.html
https://howardguitars.blogspot.com/2015 ... brian.html

Tinted tops are definitely to everyone's taste. Here's my personal take on it. Deep green that takes on different colors depending on the light - emerald green to almost black. I love it, but again, not to everyone's taste.

Getting the right mix of color in the mix is key. I find using a heavily thinned and relatively dark mix of nitro works well. You can build up the color depth without building up the thickness of the finish. I spray and level sand before adding any color. Then just enough finish coats on top of the color to avoid any sand through. It's a balancing act. You can easily build up too thick a finish.