I am understanding your wanting the glitter in your topcoat. It's been my experience that the glitter loses some of the luster once encapsulated in the topcoat. Which is why the Disco colors are so rough. What I do is coat the heads with Sally Hansen Hard as Nails, then dip in whatever glitter color I'm using. I usually then put another coat of Sally's on, but black seams to dissolve into a solid color. I go by Walmart craft section and get the multi-color sets of the micro-glitters, so the ones from Hobby-Lobby should work as well. Just use the smallest glitter, (micro). Hope this helps.
Proud to have served with and supported the Units I was in: 1st IDF, 9th INF, 558th USAAG (Greece), 7th Transportation Brigade, 6th MEDSOM (Korea), III Corp, 8th IDF, 3rd Armor Div.
1980 Ebbtide Dyna-Trak 160 Evinrude 65 Triumph