Daub
/dɔːb/
noun
Excrement or clay used as a bonding material in construction.
A soft coating of mud, plaster etc.
A crude or amateurish painting.
verb
To apply (something) to a surface in hasty or crude strokes.
“The artist just seemed to daub on paint at random and suddenly there was a painting.”
To paint (a picture, etc.) in a coarse or unskilful manner.
To cover with a specious or deceitful exterior; to disguise; to conceal.