A layer of short hairs underneath the longer ones of an animal's fur / A coat of paint or other material applied onto a surface before that of a topcoat; a coloured primer

(transitive) To apply an undercoat to.

plural of undercoat

Paint or other primer to be applied to a surface as an undercoat.

plural of undercoater

A coat of paint or other material applied onto a surface before that of a topcoat; an undercoat

present participle of undercoat

plural of undercoating

simple past tense and past participle of undercoat