I usually use it for Salvia but I hear it works for mj too and that it is more selective in what it pulls out " no oils or fats". It will evaporate a lot faster than alcohol but you have to make sure it is all gone and there is no acetone smell either. also you should evaporate an amount in a dish to see if it leaves residue. If it does dont use it.
but to tell you the truth I have great results with iso alcohol and when it is almost evaporated I put in a small amount of powdered weed to soak in the oils. makes it like commercial hash but fresher and you know what is in it. I hear some commercial hash made in other countries contains and amount of banana peels and camel dung for wieght. yuck fuck that I'll make my own thank you