The priming was a partial success. The failed part was from the prep. I had a couple of paint "steps" showing through - broken old paint was not feathered flat enough.
The paint monkeys gave me white primer when I ordered grey. Again, I struggled to see the test fan pattern, on white newspaper.
Priming was done using 1.3mm tip, 1.5 bar, max fan. The fan pattern was tiny at fluid flow of one turn from closed. I used 2 turns from closed, which gave me a 10cm fan height at a wet-able distance. After much head scratching in post-job analysis, I realised the flow had to be increased further.
There was no dust problems. I had 1 speck that was swept off by finger nail. The primer must have dried quickly when the dust landed.
The primer was runny and heavy. I was unable to use a pipette to transfer it properly. So, I have no idea how much was used. I guestimate about 50ml would be needed. The primer was strained easily using 250 micron filter.