Paint mixing question

[Muskyslayer96]

Hey Fellas,

I've switched over almost exclusively from my siphon feed airbrush to gravity feeds and it's changed up my process a bit. With the siphon feeds, I always mixed / thinned my custom colors in the paint reservoir each time and went forward. Now it's a bit different that I squirt a mixed mixture into the gravity feed paint cup.

So the question i have is about mixing / thinning paint and storage. I use exclusively water based paint and I thin it accordingly with a homebrew mix. I mix a lot of my own custom colors / metallics /pearls. Do you guys mix up a batch in a spare createx bottle, label and use? Is a custom mixed and thinned color stable for awhile? For example i like to make my own orangish color where I may mix: transparent orange / pearl powder / pearl gold / , how long would a bottle of this made up and thinned correctly be stable?
I'd love to hear how others are handling their paint especially custom colors.

Thanks in advance fellas.........Happy Holidays!

MS