Source : Webster's Revised Unabridged Dictionary (1913)

Varnisher \Var"nish*er\, n.
   1. One who varnishes; one whose occupation is to varnish.

   2. One who disguises or palliates; one who gives a fair
      external appearance. --Pope.

Source : WordNet®

varnisher
     n : someone who applies a finishing coat of varnish