A very thin, transparent film of color painted over an already-painted surface is called:

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Quizplus · Accepted Answer

A glaze is a thin, transparent layer of color that is applied over an already-painted surface to alter the tone or create a specific effect. Coating and layer can refer to any type of material applied over a surface and do not necessarily have to be transparent or alter the color of the underlying paint. Varnish is a clear, protective coating that is typically used on wood surfaces, and does not add any additional color or tone to the painted surface.

A Very Thin, Transparent Film of Color Painted Over an Already-Painted