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16oz. Brush PreservativeGood for all types of brushes.  Contains no harmful acids and is environmentally friendly.There are also brush preservatives for water-based and acrylic paint brushes, but they dry out quickly.   If you do not want to use the Mack Brush Preservative, we recommend using glycerin as a brush preservative for your water-based and acrylic brushes.  Glycerin c..