sherwin williams cc921 clear
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I’m not in California or Canada, so I don’t deal with CC921, but, looking at the data sheet, the recommendations look similar to our other clears.
The Iwata will be the same as the Sata recommendation – 10 psi at the cap. On your Iwata, to get 10 psi at the cap, you want to have 18-25 psi coming into the gun. (on a Sata, it’s about 25-30). I’d start down around 18-19 psi coming in, do some sprayouts, see how you like it, adjust from there.
Aside from that, I run everything else on my gun wide open all the time.