Greg;
I did my test last July. Here is the link (If I copied it correctly):
cs.finescale.com/…/160833.aspx
I would answer that I use the Vallejo on armor as I rarely need to sand after priming and I bought some Vallejo so I just don’t want to throw it out. It levels very well and you can spray away into all the nooks and crannies on the armor surfaces. The AK primer I have not used since as I didn’t think it provided me any reason to switch. I do remember the AK being like the Vallejo in that it goes on wetter than the Stynlyrez. I realize there are lots of preferences and experiences, but having given either the Vallejo or Stynylrez 24 hours to dry, I have only had one case where the paint peeled when masking and I am pretty sure I had some debris on the surface when I sprayed the primer.
I use Model Color and Model Air 95% of the time. The rest is Model Master from Testors and then a small amount of Tamiya. I have even sprayed Model Air on a well cleaned bare plastic surface on cockpit interiors and wheel wells (I used RLM04 and RLM66), and never had a problem with peeling when I was handling and assembling. I do always wait 24 hours between coats and/or handling. I live in Arizona so the humidity is very low and that will help the drying. I also don’t know all the chemical interactions and how that might effect things, but I think with Golden Acrylic Medium, and also a drop or two of Flo-Aid from Liquitex. I avoid water as a thinner as it can allow the paint to break down if you put too much in. I have found that the acrylic medium (which they say is an acrylic binder without any color) allows me to thin it way down with no loss of consistency to the color.
Sorry, that was more of a story than you asked for but I was on a roll:)
John