Use in fine art
Retarders are used to counter the fast drying properties of acrylic paints making possible the usage of wet on wet or other techniques which would otherwise require oil paints. Even if they will never give acrylic the working time oil paints permits, depending how much it is adding to paint, they can give anywhere from half an hour to a full day's working time.
They generally contain glycol (such as propylene glycol) or glycerin-based additives.
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