Is a polyurethane finish the same thing as a nitro cellulous lacquer finish? I bought a new stand from MF that came with a warning label, "Attention: Not recommended for guitars with nitro cellulous lacquer finish. the material of foam might cause unexpected chemical reaction that may deteriorate the finish." I'm scared to death! Anything to worry about? My new Fender Aerodyne bass has a black polyurethane finish.