Using alcohol (vodka, gin or even everclear if you can get your hands on it) seems to work the best. Others use lemon extract, but I have never tried it. It is not to say that vanilla is bad, but I get way better results using vodka. As for mixing, if you make it too pasty, it will get clumpy and be a pain to work with. If you make it too runny, you may have to put on a ton of layers to acheive the look you are looking for. Also using the correct size brush for the area you are painting really helps--you don't want to paint a big bow with a little brush because it will look really streaky. HTH
Missy
"It's the truth. It's actual. Everything is satisfactual. It's a zip a dee doo dah day!"
Missy
"It's the truth. It's actual. Everything is satisfactual. It's a zip a dee doo dah day!"