So, I started painting my armour plates last night, and aside from some issues with getting an even coat (something I'm struggling with in particular with Humbrol greens), I was happy with it for a first coat. So I come back today, crack open my Green 117 and start working on the ab plate. But, despite using the same pot and the same paint/thinner ratio, I noticed I was getting a lot of frosting and the colour was significantly lighter when dried. I thought I'd put in too much thinner, so I tested with less, and continued until I was using way less thinner than I should be and I was still getting horrible frosting. Can anyone shed some light on this? Has my pot of paint gone bad overnight?
Here's a picture of the issue although I don't know whether you'll see it clearly, but you can definitely see the colour difference.
What's going on? and does anyone have any advice for Humbrols? Blues, reds, even yellows go through my airbrush fine, but Green 78 and 117 so far have given me terrible coverage.