After several very messy previous attempts at using TiO2 powder, I saw this video and followed his directions to the letter.
His recipe consists of…
3 parts water
1 part Elmers Glue
1 part TiO2 powder
A few drops of food coloring to tint the mix
and is lightly applied with a foam brush. I used a small propane torch to pop any bubbles instantaneously!
I had far better results than the NWT spray paint methods I started with… way less messy, darker, and at faster speeds with a 5W laser vs 2.5W laser I had always used previously. TiO2 on the left, flat-white spray paint on the right.
The author uses a 10 watt diode laser and in comments section says… “10 watts and I only needed 45% power at 5000 mm/m”. IIRC I used something like 3500 mm/min and 90% or 100% power with my 5W laser… determined by doing a test tile.
YMMV.
– David