Gary, I’m glad you tried and like it. I experimented with many including SprayMax and found the SEM to be the closest to true HVLP primer and for the high build stuff, perhaps even better.
If you get a case (12 cans), there are Amazon and eBay sellers listing it for $170-$190 shipped making each can about $15 which is still more than most but less expensive than anywhere per can. That’s what I do once per year, get a case of tan, black and grey. Lasts all year, often well into year two.