When I was trying to figure out paint tools sai I had a hard time finding helpful tutorials.
So I’ve decided to post some things I’ve discovered that were useful. (And maybe might be useful to you)
http://i.imgur.com/9M5XpMw.jpg
ALSO! Holding “ctrl” + “alt” and pressing your stylus to the tablet will allow you to change your brush size on the fly.
I don’t use Paint SAI, but maybe this’ll be helpful for other artists?