One of the mysteries of the English language finally explained.
A wooden or plastic block with tips of nails just protruding through its base, used to scratch the surface of plaster lightly to enable more plaster to adhere to it.
- ‘We key the surface using a devilling float, which is a wooden float with nails knocked in it, lightly scrape this across the surface and it will score the plaster, ensuring that the coat of finishing plaster adheres correctly.’
- ‘An old wooden float with board nails in one edge is a good tool for this job (this is called a "devilling" float in the trade.)’
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