I really detest the Testor's as it varies with each batch...
some of their gloss white virtually NEVER dries. The gloss greys get gummy. The blue does okay if I shoot with the garage door open in the daytime. If I shoot at night with the door shut and all the humidity trapped in the room, it never dries.
The Tamiya spray cans are consistent no matter how many you buy or when. They don't do a gloss blue tho...