So i'm practicing with old wicked white and it does ok but does thicken up after a bit, so i put in wicked reducer 0100 but i put in too much
approx what is the paint to reducer ratio ???
also i'm at 20psi
As
@SiRoxx mentioned, there is no blanket magic setting for reduction ratio and air pressure that will work flawlessly for everyone. There are a lot of factors that contribute to how a given reduction ratio and air pressure will perform for each individual artist. Finding what works best for you will require some experimentation.
I pretty much use Createx products exclusively and I have a wide range of their paint, including very old original paint formulations, as well as the newest formulations. I am generally in the range of 25 to 35 psi with an airbrush comparable to what you are using. My paint reduction is generally somewhere in the range of 2:1 or 1:1 (the first number is the volume of paint, the second is the reducer). That information should get you in the ballpark, but you'll still need to play around and find what works for you.
I've experienced what you described using the newest Createx paint formulations, particularly with Wicked Opaque White, Illustration Opaque White and 4011 Reducer. So, I don't believe the age of your paint and reducer are contributing to the issue.
I often keep reduced paint in small plastic 1- or 2-ounce containers with lids for those projects that require more than a day to finish. When I return the following day, the reduced white paint has almost always thickened up to a point that I need to add more reducer. It is completely normal for reducer to evaporate over time. I don't know why that tends to happen more rapidly with Createx white paint. I've had good success adding a small amount of reducer to the mix the following day. After about two days, that success drops off based on my experience. Emulsification between the pigment, binder and reducer seems to break down after that two-day time frame. The paint performs like it was way over reduced at that point. It doesn't cover well, and it will spider out easily. Adding more white paint to the mix doesn't seem to help either.
So, when it comes to Createx white paint specifically, I generally mix very small amounts, or only what I need (which is good practice anyway) and get rid of it after about 48 hours. If I need more at that point, I'll mix up a fresh batch.