Answer: chalking

AnswerCrossword Clue
CHALKINGPaint aging process
chalkingRub (something, esp. a pool cue) with chalk
chalkingDraw or write on (a surface) with chalk
chalkingCharge (drinks bought in a bar) to a person's account
chalkingCHALK, to mark with soft limestone
chalkingDraw or write with chalk