does anyone here paint using acrylic?   

You'll want to use a very fine-bristle brush so you won't see the brush strokes so much, and seal it with a clear lacquer when you are done.

Fine sable brush is indeed the best for acrylic. It you have quality brush that costs cheaper, better use those because of all painting medium, acrylic is very harsh on the brushes. It will destroy the bristles in no time. Rinse the brushes thoroughly after each use. I have not tried it in glass though but its waterproof when dry so I think its good without the laquer.

Fine sable brush is indeed the best for acrylic. If you have quality brush that costs cheaper, better use those because of all painting medium, acrylic is very harsh on the brushes. It will destroy the bristles in no time. Rinse the brushes thoroughly after each use. I have not tried it in glass though but its waterproof when dry so I think its good without the laquer.