Brian's paint is quite thick, so yes, you go by feel. The Gillespie paint can almost be sprayed with no reduction, so for it perhaps 5 to 10%. For Brian's paint, closer to 20-25%. If you pull your stir stick from the mix, it should run off easily and just start to drip. The biggest indicator is how it sprays. If you find you have to raise the air pressure to get it to spray, and it still does not come out well, then the paint is too thick.
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