render coat

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scratch 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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A Hire a cement mixer which will cost around pounds 30 for the week, mix one-cement-to-three sand for the scratch/undercoat and the next day mix up a one-cement-to-four sand render coat, both of which are applied by a hawk and trowel.
In other areas walls are frequently finished in a render coat.
Render coats are often applied to help stop driving rain penetrating through the wall.