So I bought a Pasche Talon years ago as a starter kit to airbrush models, PVC figures etc. About 3 years ago I started this PVC figure and I had two Talon brushes. All the paint layers were fine and then it came time for clear coat. So I asked the guy at my local hobby shop how to mix a clear coat, because I followed online tutorials and had no luck. He sold me an acrylic base from Tamaya semigloss and said thin it 50/ 50 with Tamaya thinner or denatured alcohol then you can thin it more if u like but start with 50/50. NO Isopropyl Alcohol he says, it'll swell all the seals and grommets, kill my brush etc.... No worries I'm only using denatured alcohol with the acrylic paints, was told this by a few other people. Mix 50/50 spray sputter, thin thin, sputter, thin, sputter, just air bubbles in cup. So I take apart the airbrush and clean it and it looks good and clean soaked put it back together and bubbles in cup hiss hiss. Hmmm Go to the local Airbrush guy who is no longer around at an art store that no longer exists ( real bummer) he says, " Oh you soaked it and removed the packing needle bearing, or you soaked it and didn't do that? " NO I didn't know!!! So he informs me Pasche Talon has a garbage packing needle bearing, and if you soak the brush with it in it or scrub it with a cleaner brush you kill it, get bubbles in the cup. Looks like a clog he says, but it's the packing bearing, trust him he's been doing this forever. Ok so I order the metal /nylon packing bearing, carefully remove it , install the new one. HISS HISSS bubbles in cup. Okay I have another brush screw this, I thinned the clear like 20 clear / 80 denatured alcohol, no issues, then I got a job where I could't do anything but work, never finished that kit. FF to today, break out the airbrush, the good one break out a Pinkie Pie Figure and start painting. Same thing, all the paint looks good, lets mix a clear coat, I umm forgot so I go back and turns out I forgot this guy gave me bad advice years ago, and 50/50 !!!!!!!!!!!!!!Brush #2 same thing, again I forgot about the packing bearing!!!!!! ordered a new one two of them, soaked the airbrush in denatured alcohol for over 12 hrs. Bought an Iwata Eclipse CS and. I wont kill this brush! It's amazing! So Long story short I would like to finish clear coating Pinkie Pie. I'm using Tetsors semigloss base, and denatured alcohol. What is the ratio to mix so I don't kill a brush?