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A layer coat of refractory lining that is applied to an existing lining in an attempt to extend the lining's life is known as:
Correct Answer: B
The term "overlay" is defined in refractory terminology as: "Overlay: A layer of refractory material applied over an existing lining, generally to extend service life or repair localized damage." - API TR 980, Section 2, Definitions The other terms do not carry this specific meaning in the context of refractory maintenance.
