I’ve used army painter, and it ain’t that great David. Lacquer primer is far superior.
I've never used it Tim so wouldn't know i was just trying to suggest a simple answer to the fellows problem ,whilst in the beginning when airbrushing held a certain amount of trepidation I primed all my builds with humbrol rattle can primer then used expo rattle can primer(comes in three shades) all with zero problems its like shake and vac but shake and paint ,the only rattle can primer I had a problem with was
tamiya it dried rock hard and super smooth , paint adhesion was very poor.
I do wonder if some of these problems are comming from the fact that most primers now are super smooth self leveling, the paints used acrylic or lacquer have such super smooth pigments that there's hardly any form of adhesion between the two.
Me my go to primer is mig one shot thinned with mr color aqueous thinner fifty fifty or even sixty thinner forty primer this ratio is worked by drops say five drops of primer from the bottle five thinner from a pipette straight into the
airbrush cup mixed with a brush ,a couple of passes over some printer paper (I try and use a good quality one I pretend only the best for the daughters home work)just to check flow and air pressure and off you jolly well go ,it was pointed out to me they say dont thin it but I read the bottle it only says no need to thin nothing about dont ,lifes to short .
I did hear of another way (please people this is tounge in cheek)store your primer under a large cabbage leaf , on the third Thursday of the month look for a bat to pass before a full moon it must be past midnight with absolutely no dew on the ground ,immediately attempt to prime your model using either leprechaun spit or wiches milk to thin the paint this procedure should be carried out in the hen coop by candle light ive never tried it my self but have been assured it pretty much fool proof.
Stay safe all and good luck with your problem. Dave.