Hey Exo,
Glad to see someone else out there is using this great stuff.
To clear coat an item you might want to try acrylic spray can. The method I used was to simply spray from about 10-12 inches away from the item. When the acrylic hit the object it almost instantly dried on contact. Also you can handle the part in about 15 minutes, without worrying about damage to the finished surface.
Crystal Clear in very light coats actually works. Don't over do it, as it will show off an uneven glossed surface. Try it on a practice object.
When using other paints over Fusion or Plastikote there seems to be no problem, but when you spray this on other paints, no matter how long it has been dried, it will actually crack the paint. You can use it with some success on paint, only when you apply thin coats at 1 day intervals. Very time consuming.
Hope this helps.