Thanks, Grout! Ahmanagonna use your ratio in my signature files to save our fellow painters a few bucks. And reactivation issues.

Gregor on Dakka: Army Painter Twitter account has responded and shown that reactivating is a cause of very slow cure time. Both AP and Juan Hidalgo have reported that given enough time to dry, the paint does eventually cure and seal as a basecoat.
Hildago, a reviewer: Hidalgo said in his original review they were reactivating after a hairdryer and 2 days... so are we talking a week or something for them to fully cure?
Stahly, another: Yeah, didn't Stahly wait 24 hours for his testing, too?
Me: I think I'll stick to brushing on colored primers and a wash. USA Airbrush Supply has a BOGO on the holidays.

EDIT: Garfield666 on Dakka: "Sooo... I painted some WF Cannon Fodder with their orange jumpsuits on monday. Painted the backpanel white with Vallejo the same evening - reactivated in an orange mess. Today (friday), painted over the area again in white - reactivated almost instantly. So I don't really believe their excuses. This is either flawed or deliberately swept under the (marketing) rug. Don't get me wrong - the colour feels good to paint and the results are nice. But only being able to paint over it with very dark colours severely limits the usefullness for me. Without the reactivating issue, I would rate these as amazing colours in their own right."
EDIT EDIT EDIT: Irdiumstern on Dakka says the paint reactivates with water. "What primer are you using? I've waited 24 hours, applied a bit of water via brush, and the color reactivated." IIRC, GW's contrast paints reactivate with contrast medium.
*****
EDIT EDIT: Bogenwald paints his 6mm. As an experiment, he painted white over a red flag that was dried for 24 hours and got this.
https://bogenwald.blog/2022/02/23/speedpaints-day-2/