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Halftime Plaster Accelerator is a chemical additive for use with finishing plaster. The additive speeds up the curing process of the plaster by speeding up the chemical crystal formation that causes plaster to set or harden. Halftime is recommended for shortening the setting time of finishing plaster. Halftime will shorten the setting time by up to 60 minutes, depending on the ambient temperature and relative humidity of the working environment.