Your observation is correct. He can do just about anything, pero set-up ang specialty ni Jun. Matagal siya mag-refinish, sa totoo lang. Tsaka acrylic lacquer at polyurethane lang ang meron si Jun. Kung ok na sa yo yun, then go for it.
But if you want a lot of options for your guitar's paint job, try others first. I've seen Elegee guitars with matte/oil finish. Ayos yung trabaho. For nitrocellulose lacquer, nandyan din si Arie or micsis. I don't know if any of them use shellac, though.