All accords to manufacturer and the viscosity of their particular product, you will have to experiment with a bit of dilution, don't try to spray emulsion without dilution it will splatter everywhere, also do ensure its filtered, I used to filter at least twice on all finish's. In the end I never used a viscosity cup, far too messy, the feel of the paint should be somewhat like single cream, try, dilute more or less and try again, I would hang a bit of cardboard on the barn door and just try it out until I found the correct dilution, them indelibly write what I found on the paint tin.Sorry if you've already mentioned this elsewhere MikeJhn, but which tip do you use for emulsion?
The splatter shown in your post should not happen at all, I would suggest the paint was not mixed properly, you can't just constantly say I was in a bit of a rush, spraying correctly takes time and effort, give yourself a break and slow down.
The bubbles on the pine test piece may be contaminates on the timber, all timber needs at least a wipe down with a tac rag and a bit of de-contaminating and sanding before spraying.
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