I've never used Humbrol acrylics so I have no idea what is best for thinning them. It sounds like water worked. It is very difficult to give thinning ratios as it varies from brand to brand and even different paints from the same brand. You will often see people aiming for a consistency "like semi skimmed milk" which is not bad advice. I usually thin and mix in the paint cup and look for the paint to run of my mixing stick fairly easily whilst still forming a drop. It's all a bit vague and really you need trial and error to see what works best for you and your set up.
Don't forget that the pressure you spray has an effect. Don't spray at too high a pressure (10-15 psi works for me,sometimes less for really fine mottle or similar) and don't spray from too far away!
Once again I'm afraid that you'll have to experiment to find what works best for you.
One last tip - a common problem with acrylics is a tendency to dry in and clog the nozzle. As an ex-enamel guy I found this the single most frustrating issue when I changed to acrylics. I now avoid this by adding a drop of "retarder" to the paint cup. Retarders for acrylic paint are available from any art supply store and work a treat. I use a brand called Liquitex but there are others.
Steve
Don't forget that the pressure you spray has an effect. Don't spray at too high a pressure (10-15 psi works for me,sometimes less for really fine mottle or similar) and don't spray from too far away!
Once again I'm afraid that you'll have to experiment to find what works best for you.
One last tip - a common problem with acrylics is a tendency to dry in and clog the nozzle. As an ex-enamel guy I found this the single most frustrating issue when I changed to acrylics. I now avoid this by adding a drop of "retarder" to the paint cup. Retarders for acrylic paint are available from any art supply store and work a treat. I use a brand called Liquitex but there are others.
Steve
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