KTM-9 water Based Finish is a very, very good product. It works just as good as nitro - sprayed or brushed - over natural wood or dye stain colors. Spray finish equipment is necessary if you want to mix color(s) in the lacquer coats or if you plan to do sunbursts. HLVP guns and turbins are prefered, but regular spray guns works good, too.
Some older water soluble finishes feels sticky when they're exposed to sweat, but this is not the case with KTM-9.
By the way, System Three's products are brilliant, too.