It's really thin, so the only thing you really have to worry about is having it run. It certainly doesn't need to be thinned before spraying though, which is nice.
So should I use a smaller needle? I use a Paasche and of course the large needle for spraying normal acrylic paint.
So medium, small?
Jason
Sorry, just saw this...
Try the medium first. If you have any trouble with the Future clogging up the tip, you'll have to move back up to the large tip... but I don't think it will be an issue as you're not pushing any pigment through with the acrylic carrier.