I’ve been kinda stuck and frustrated for the last several days. After the one good engraving of the Aboriginal fellow, I’ve had nothing but rejects. I thought maybe I needed to thin… then needed more white glue… and Floetrol… and still nothing seemed to work. And to top it off, although I knew what ingredients were in the mix, I totally lost track of the proportions. All I was getting was spots and brush strokes…
Finally decided the spots are a surface tension thing… and added a missing ingredient, Dawn liquid dish soap. Added some to the existing mix and, sure 'nuff, the spots went almost entirely away.
So decided to mix a new batch from scratch… and religiously followed a recipe I thought should work. I used "1 tablespoon = 1 part" and the concoction all fits in a little 6 oz. jelly jar, with room to allow gently stirring with a stir stick to avoid bubbles. Stirring as you go, the recipe…
2 parts water
1 parts TiO2 powder (heaping)
2 parts PVA white glue (Elmer’s School Glue)
2 parts Floetrol
1 part Dawn liquid dish soap
10-12 drops red food coloring
The result is a very smooth paint which brushes on and nicely adheres to the glossy tile surface. One "heavy but not too heavy" coat… no white tile showing. Lasered our favorite friend/villain, Wes Studi… Toughest Pawnee, from "Dances with Wolves" on a clean tile…
Before paint removal…
after paint removal…
Magua (bottom left) compared to previous tries…
Hopefully, this isn’t a "one-hit wonder" and I’ll be able to do more tiles with the same mix and same decent result. I’m ready to move on… or at least get shut of this paint stuff 
– David