I'm finding myself no longer able to use solvent based paints and I am looking to switch to a true water based acrylic.  I have some Lifecolor paints, but haven't really tested them much yet.  I would appreciate if you could help me track down some tutorials on how to use Lifecolor acrylics by both brush and airbrush.  Techniques, what to use underneath, best brushes, airbrush thinning ratios using Lifecolor thinner, time between brush and airbrush coats, etc.