Metallic paints
I don't think its much of a secret that I have a strong preference for metallic paints. I use them on all my 30MF customs. I'd like to share some tips for using the army painter line of metallic paints.
Firstly, I use brushes. Spray cans are nearly impossible to get where I live, and airbrushing is impractical with the space and roommates that I have. I use the army painter brand metallic paints from different lines, but they all behave loosely the same from a hand brushing perspective.
Shake it like you hate it. Then shake it some more. Soak the bottle in warm water first if you haven't touched it in a while
THIN YOUR PAINT. This should go without saying, but its vital when hand brushing acrylic paints. I use water, you may prefer something else
stir your paint, even while you're using it. The metallic flakes will settle slowly, so longer paint sessions will see the sheen go down if you don't keep the particles suspended.
keep layering. Two thin coats is the normal preference for a standard opaque model paints, but building proper metallic lustre typically takes 4 to 6 depending on the colour. This is why you thin the paints slightly more
It may seem counterintuitive to thin the paints and layer more, but I have had better results with thinner paint and more layers than I have with what I would consider regular dilution.