Thanks Sturm, glad you liked it, good reply too, I have fixed the word "very" in my master.
You could theoretically exchange the water for a glaze, just bear in mind that you still want the paint to be thin, so the glad/paint mixture may still need watering down if its a thicker glaze medium.
You also want to keep the surface matt, so only a matt glaze would be usable really. If it is not matt, your subsequent layers will bead off too easily and be a major paint to make behave!
I am glad to see you are trying the technique due to my tute. This is the sort of response that makes the time and effort put into these things entirely worth while! I too was in your boat for a while until I saw someone using the technique and figured it didn't look that hard. Hearing about it makes it sound very complex when in fact it is very simple, just hard to do, if that makes sense?
Essentially it is a great technique that saves time but need practice and lots of it to work.
I will try and take some decent pics tonight some time and update it over the next few days.
If you are going to try this out I'd recommend using a strip of flat plasticard or something similar to try it on first, not your models...
Good luck and thanks for your response!