and fwiw, I don't go all the steps (usually 120, 150, 180, 220 and 320 in a garnet paper which is where I start finishing). Each three coats gets scruffed back with 320 or 400. At the end I'll start with 600 wet and dry (wet) and go to 2000 before the final polish.
A friend just brought his first build over the this weekend - he finished with rattle cans of lacquer and said he had put 15 coats on. In my opinion that was not enough, he did sand through and feels that he'll have to go back and spray some more. I think I usually end up with 18 or so coats on spruce and 24 or more on the back and sides. You can also build with satin lacquer - it has more solids and goes on thicker.