Undercoat

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undercoat

[′ən·dər‚kōt]

Undercoat

A coat of paint applied on new wood or over a primer or over a previous coat of paint; improves the seal and serves as a base for the top coat, for which it provides better adhesion.

Undercoat

 

in most mammals, the lower layer of the hairy covering. Made up of soft, fine, twisted hairs, the undercoat fulfills the primary heat-insulating function of the coat. In some animals, for example, Merino sheep, such fine hairs form the entire hairy covering; in others, such as the musk deer, there is practically no undercoat. Aquatic animals and animals adapted to a cold climate have thick undercoats. In wool-bearing animals the underfleece is more valuable than the outer fleece.

undercoat

1. A coat of paint applied on new wood, or over a primer, or over a previous coat of paint; improves the seal and serves as a base for the topcoat, for which it provides better adhesion.
2. Any paint which acts as a base for enamel.
3. Any primer which is colored.
References in periodicals archive ?
This means you need to sand it to take off the gloss, then apply wood undercoat (or combined wood primer/undercoat) to give a matt finish ready for the new topcoat.
If the undercoat takes in solvent and swells, a compressive stress will develop causing the coating to buckle in a manner similar to the skin described above.
Both new surfacers are part of the DuPont Refinish ValueShade technology platform which improves topcoat performance by applying an undercoat in a shade of grey.
Undercoats also help to 'anchor' coloured topcoats to prevent them from flaking.
So I sanded it down and used a good quality undercoat and two coats of gloss.