QUOTE: I didn't let the first coat cure like I should have. Is it a good idea to apply an enamel primer before spraying an acrylic color, especially white or yellow?
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Acrylics dry fast. I've had no problems applying subsequent coats after 15 minutes of drying time in front of a fan.
Acrylics do not adhere to plastic very well at all. They basically just form a coating over the plastic. The tales of people (myself included) who spent a lot of time getting a paint job just right only to have masking tape rip it to shreds are numerous.
Enamels and laquers adhere to plastic much better than acrylics, and acrylics adhere to primer much better than they do to bare plastic. Scuffing the plastic with fine sandpaper, steel wool, or even ScotchBrite pads helps acrylics adhere better. Priming parts is the best way. I have never had acrylic over primer pull up.