I love the idea of this one a lot more than I love the actual result. It's just not that clean and it's really bothering me. I didn't actually keep it on very long because of it. Again I used acrylics for my rainbow because of their opacity. Try layering a red polish over black and you'll need at least three coats to get decent coverage. I guess I could have done a white dart, then layered my rainbow over the top of the white and been able to use polish.
In the process of this design I also learned that using acrylic paints with a tape mani is a bit trickier than a polish tape mani. With polish you want to take the tape off quickly, while the polish is still wet. With acrylic I learned you should wait for it to dry, and even then, the tape may pull some of the paint off or stretch it out. Not a fan of taping with acrylics. Lesson learned. However, I can't promise I won't try it again in the future and learn this disappointing lesson all over again.