Roughly 25% following the instructions on the cans. I mix enough for several coats and only spray what I need and store the rest in the fridge each day. I'll spray a coat and wait 24 hrs and sand with 320 as needed then put on the next coat. I do this for 4 coats of gloss then 2 coats of satin. I'm sure there are better methods, but this works for me. However, I'm always looking to improve!