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Final thoughts on Vallejo Mecha Color
Made for airbrush, dries well and stays true to its sturdy-after-24-hours claim.
Metallics being metallics will be much more vulnerable to being rubbed off to topcoat's of course a must, but damn do those solid colors last.
Yes, you can handbrush them, just put a few drops into a VERY small container and leave for 45-60 minutes, stirring every 15-20 minutes, and keep your brush damp as you go.
Matt Varnish is very smooth, no visible flakes, but good luck getting tape to stick to anything but broad flat surfaces. Also dust your parts at an OCD level before topcoating, if any lint-y fibers get stuck in there and stick up, you're in for a fight to yank them out.