Very nice application of Folkart. I experimented with Folkart with mixed results. My results varied significantly from color to color. I might have to try it again after looking at your work. You said that you thinned the Folkart with finish. Are you referring to a clear or the Aztec pearl in the picture?
You could use it for CA Kicker. I don't like spraying the Kicker because I don't want to inhale it. I generally put a drop above the glue joint and let gravity pull it down over the CA. These bottles would work well the the gravity method of applying CA Kicker.