WordNet sense 1 (made of or covered with wax):

waxen

WordNet sense 2 (resembling or covered with wax):

ceraceous, waxlike, wax-coated

WordNet sense 3 (having a surface free from roughness or bumps or ridges or irregularities):

smooth

WordNet sense 4 (weak in color; not colorful):

colorless, colourless