May not be the paint's fault, but I'm not happy with the outcome of the cab on the WC52. I'm sure it's my fault and goofed somewhere, even though I have overthought this project from the start. The one detail that I'm seeing is that the painted parts that are still not hardening are those that I put a base of semi-gloss Behr Marquee on first. Even after scuffing that paint, then re-applying flat Behr, the paint can be lifted with my fingernail.
2 days ago, HD was out of the Marquee, so I bought the Ultra in the same shade. The paint laid on great, and hardened in 24 hours!
The cab has been 'drying' for over 2 weeks, and it is still somewhat sticky to the touch- so perhaps another 2 weeks to see if it will harden up? My plan after that is to pull it, remove all paint, then re-shoot with the flat Ultra. Not sure where I went wrong, though...