Re: Duracote spray gun?
I use HVLP 20 oz. gravity guns. The low priced version. You don't need anything bigger. I usually only mix up 2 tbsp. max at a time.
For the mural and airbrush work I have the old trusty Paasche airbrushes.
You could certainly use a high quality HVLP gun but if you forget to clean it and the DuraCoat sets up you might have to toss it. The consistancy of DuraCoat is about the same as automotive mixtures. I did custom airbrush work on Harleys, autos, helmets, etc... for several years and I use the same equipment for the DuraCoat.