Thanks. I use a no.3 tapered round brush which I squeeze with my fingertips to get a really fine edge. No special expensive stuff. My brushes last about 3 paintings and then I toss them out.
ohhh ah, okay! Thank you for the info! 
And the same here, i used to paint with oilcolors and brushes never made it for more than 2 or 3 paintings.
And the same here, i used to paint with oilcolors and brushes never made it for more than 2 or 3 paintings.