Mark Mandell - Gone Round In New Jersey
Rattle can lacquer is notoriously heavy on solvent, light on resin so it will take a lot of coats to build a finish. A good gun lacquer like Campbell will have less film color and will build much faster. The lacquer will, however, require some serious venting where the shellac, while needing the alcohol to be exhausted, is not so demanding. You can, btw, spray your shellac exactly the same way. I use shellac on my turnings and apply it with an HLVP mini-gun both on and off the lathe.
You might also consider the new acrylic lacquers like Target EM 6000 that have the self-amalgamating (100 percent burn-in) property of solvent finishes, but with a higher solids content and even faster build.