Here Duco is just a word for paint jobs in general. we say hey mate Nice duco. By solid i mean colors like original datsun colors not metallic another term is flat colors. You can get acrylic to shine as good as 2k lay it on block it with 800 lay on some more and then lay on 2 or 3 coats of acrylic clear. cut it buff it mmm nice. At the end of the day yes 2k holds up for longer when it comes to straight off the gun but both all depend on prep work.