All this being said about HVLP guns, it might surprise the reader that Woody still uses a traditional bottom-canister, siphon gun. That's because I believe that "It's better to deal with the devil you know, than the devil you don't know."
Right now I am probably in transition to an HVLP gun, but I've been using a siphon gun for 30+ years and I know how to use it to spray high volume with little over spray as well as how to control it for detail work. The gun is designed for auto body work, so I've modified it a bit and learned to control it to suit my needs. For instance, I am now using a smaller nozzle (and a larger compressor) for clear finishes. Auto paint is thicker and requires a larger nozzle. When shopping for a clear coat nozzle, 1.4 mm is about right.
As mentioned last month, the 2016 five-guitar project is nearly complete, the finishing process is underway. When I first started building instruments, I felt that 'finishing' was the wrong word to describe this process. Actually, I believed that it ought to be called 'starting all over again'.
The tools, equipment, processes and even the work space has to be completely different from a woodworking project. Finishing is not a process that Woody looks forward to. This is because finishing is not wood...working. Finishing requires the use of tools and materials that are unrelated to shaping wood to dimension and assembling components.
Just because finishing requires new and different skills, however, there's no reason to complain. If done in a controlled manner, finishing adds value and appeal to your work already completed.
If one has built a guitar from scratch, the labor that went into it can only be fully appreciated by another luthier, and maybe a few musicians. The other 99.999999% of the world will judge it by what they see first... the finish. That's just the reality of it.