Hi, I am new to airbrushing and just bought the Iwata hp-cs... The guy at hobby lobby who opened the airbrush case for me told me that he used to be a airbrush teacher and used Liquitex acrylic paint in the tubes and reduces with water. Last week, I put a couple of different Liquitex base colors in bottles and reduced with a homemade reducer which I acquired the formula through a google search, & I reduced the paint to the viscosity of low fat milk. Today, I go to airbrush, and my paint is coming out inconsistently.. I thought it was tip dry, and took my needle out to clean. After putting a clean needle back in, it was still inconsistent. My next thought is that it's the paint, perhaps clumps are in it. I don't recall seeing any YouTube videos of people pre-reducing paint in bottles, they all reduce it right before they paint.. Maybe letting it sit for so long and separate(of course I do shake it well), led to the paint gumming up. Any suggestions? I think I may dump that paint and reduce it right before airbrushing and instead of homemade reducer, I am going to use water and see if that resolves my problems.. Can anyone shed some light? I took my airbrush apart again and noticed that the little brass piece where the needle rests, was clogged with dry paint, that hole is so small and I could not clean it out with my airbrush brushes.. I had to use one bristle off of a toothbrush.. Am I thinking about this right? Or should I just invest in some spectra tex airbrush paint? Anyone else use Liquitex paint in the tubes?