Some tips from a longtime user
I stopped even trying brushes to apply it almost immediately - just smooth it on with a cocktail stick, sculpting tools etc. With practice you can get very precise applying it with hard tools.
But because the stuff peels so well if you make a mistake don\'t try to rectify it when the stuff is wet, wait for it to dry and then remove it or tease it back. You can refine edges between zones this way very effectively.
Generally you can also speed up the drying of these with a hairdryer, but try a small test first - different masking fluid/paint combos might work differently - and don\'t make it too hot.
Einion