I mixed the titanium white powder with the baby oil and it made a nice smooth creamy paste.
Next I applied it with a (new) one inch brush to a new redrob bell taget face and it has gone on OK, but it is a little bit streaky.
I am guessing the mix may be a little too thick, or the face being new will give an improved cover with more use, or I need a softer brush!
Not sure which yet, but I am on a role now and will keep experimenting until I get a nice smooth streak-free covering ( is this possible?).