1) Apply paint heavily to 
to lay paint or colours thickly on
• (v. t.) To knead; to make into paste; to concrete. • (v. t.) To lay color on canvas by uniting them skillfully together. [R.] Cf. Impasto.
Im·paste' transitive verb [ imperfect & past participle Impasted ; present participle & verbal noun Impasting .] [ Prefix im- in + paste : confer Italian impastare , Old French empaster , French empâter...
to cover with or enclose in a paste.