Undercoat

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undercoat

[′ən·dər‚kōt]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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.
Use knotting solution, which you apply only to the knots, or, better still, paint all the wood with Ronseal KnotBlock Wood Primer & Undercoat (from PS7.98 for 250ml, B&Q), which is water-based and nicer to use.
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.
As well as two layers of undercoat (pounds 6.99) slap on two layers of top coat.
Soak-in is the defect where paint sinks down into a substrate or undercoat instead of forming a smooth, continuous layer on top of it.
Are you sure you used an oil-based undercoat and top coat?
IF you''re repainting a radiator, sand it down, clean it off and prime and undercoat the metal, especially any bare metal, before applying radiator paint (make sure the radiator''s cold and the heating is off first).
IF YOU'RE repainting a radiator, sand it down, clean it off and prime and undercoat the metal, especially any bare metal, before applying radiator paint (make sure the radiator's cold and the heating is off first).