The Collaborative International Dictionary of English v.0.48:

Dauber \Daub"er\, n.
   1. One who, or that which, daubs; especially, a coarse,
      unskillful painter.
      [1913 Webster]

   2. (Copperplate Print.) A pad or ball of rags, covered over
      with canvas, for inking plates; a dabber.
      [1913 Webster]

   3. A low and gross flatterer.
      [1913 Webster]

   4. (Zool.) The mud wasp; the mud dauber. Daubery

WordNet (r) 3.0 (2006):

dauber
    n 1: an unskilled painter