A device, machine, or person that applies a coating or covering to something, such as paint or varnish.
From 'coat' as a verb (to cover with a layer) plus the agent suffix '-er'. This technical term emerged in industrial manufacturing contexts during the 19th century.
Modern coaters are incredibly sophisticated—spray coaters can apply perfectly even layers of paint, powder, or other materials at incredible speeds, like thousands of car parts per hour!
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