I personally airbrush it, but I will admit I've never tried brushing, just dabbing spots with a Q-tip. I'm still trying to find the perfect way to airbrush it though, I tend to get some runs that I have found sanding down works pretty well on.
I also saw a suggestion to use the Alcad clear gloss and that it works really well. So that's on the bench to try for the next build!
Groot