So what to do, what to do? I really like using this type of a palette for mixing small amounts of paint (airbrush or otherwise), but the cleaning of it was a problem and a hassle. I needed to find something that airbrush paint and other acrylic paints wouldn't stick so tenatiously to.
I posed the question to a model horse Facebook group I belong to, wondering what other people used that worked for them. I also searched various art supply sites for ideas. Good ideas came from the Facebook group and here is what I ended up with:
I LOVE it! It is perfect for mixing small amounts of color for either hand-painting or airbrushing. It is just heavy enough to stay put when swishing the brush around to mix paints. And best of all, it is EASY TO CLEAN, even super stick'em airbrush paints! A brief soak in hot water and a quick scrub with a cloth is usually all it takes to clean it (although sometimes the encouragement of a scrubby sponge is needed for stubborn colors).
Another person from the Facebook group suggested using silicone ice cube trays. Brilliant! I rushed off to check out eBay and Amazon for said silicone ice cube trays and found LOADS of them. Sadly, most of them were colored and I simply had to have a white one. I'm not that good at mixing colors to begin with, so I didn't want to contend with mixing colors in a colored tray. It HAD to be white so the color of the tray didn't influence my perception of the color I was attempting to mix.
Eventually I found what I was looking for on Amazon (see the tray on the right in the photo above). They came in a pack of two. The silicone ice cube trays work best for mixing larger amounts of paint, or paints you want to use over several sessions and want to keep for a bit. I put a piece of glass from a small photo frame over the paints but anything flat and somewhat heavy will do (piece of plastic wrap and a small book, etc.).
To clean it I just let the paints dry and then moosh and bend the tray to get the paint to flake and lift...
You have no idea how happy these two easy-to-clean paint palette/trays make me!