Scalecoat II has better drying properties than regular Scalecoat and doesn’t need to be baked, so it’s better for use on plastic. With Floquil, you had to be cautious that it didn’t craze plastic. Also, there is another brand out there that is acetone based (Floquil was based on toluol) that is pretty good too. I believe it’s called true-color, and it comes in both sprayable and brushable formulas. So far, I’ve had good results with it, but I’m not fond of its plastic bottles rather than glass.
Bill in FtL