Doing a bunch of priming over the past few weeks, I used both GW black and Armory Black.
The GW spray worked flawlessly both outside on a fairly warm day with some humidity and also in a basement where the climate was controlled.
The Armory spray however, has been giving me all sorts of problems. I found that outside in any kind of warmth it's useless, it chalks up on the mini. and makes a mess of the detail.
The only time the Armory worked well was inside with air-conditioning. In fact in climate-controlled air the Armory worked as well as the GW spray.
But my other question is…does spray primer or varnish have a shelf life? As in, after a certain amount of time it loses its ability to function properly? I can't imagine that something in a compressed can would somehow expire where it wouldn't work anymore.
For reference, the GW spray was bought in 2012 and not used until just this month in 2017, five years later. And it was perfect. Absolutely flawless. The Armory spray was also about five years old.
Also for reference, I used the same five-year old Armory spray on several GW plastic terrain kits and also on several resin buildings just last year and it worked flawlessly.
I'm really at a loss as to why the Armory spray is so temperamental, but I'm ready to give up on as I have to now go back and clean up about 40 models that it chalked up on today.