excess paint. with a very light hand, just barely touching the surface, roll only once in either an upward or downward motion onto the black board, lifting the roller off the surface completely before moving to another part of the board and repeating. mix up the direction and the pressure of the roll in order to build up texture. those lines you see on the board? i made them by doing a quick straight down then up bang of the roller brush onto the surface of the board. stop when you are happy with the texture and allow to dry completely.
scoop up some of the crackle paste with a palette 