Scratch coat

Scratch´ coat`

The first coat in plastering; - called also scratchwork. See Pricking-up.

[′skrach ‚kōt] (engineering) The first layer of plaster applied to a surface; the surface is scratched to improve the bond with the next coat.

In three-coat plastering, the first coat of plaster, which is then scratched to provide a bond for the second (brown) coat.

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