priming coat

It is used chiefly in the priming coat and as a base for some red paints.

Later on, he used distemper just as a priming coat on top of the grounding.

Usually, a "priming coat" of bitumous paint has to be applied first.

The priming coat is a thin coat of white lead, red lead and driers mixed with linseed oil and turpentine.

The furniture-bed, table, chair-had been seemingly washed almost clean of its covering of paint or varnish or French polish, and the wood showed naked and old, with patches of white, perhaps a stubborn priming coat; or perhaps it was part of the bleaching style.