I am guessing he just tossed the comment in to give you a pointer that you may not have known. A lot of people, most that are fairly new to the hobby anyway, usually don't consider things like checking fluids in purchased pre-assembled components. So just know... neither do the people that make...
I use an airbrush to paint mine. Parma Faskolor, Createx, or any airbrush acrylic works. I also use Spaz Stix, but that is an oil based paint, and very stinky.