Homax Paint Hardener is an paint management solution that turns liquid paint solid for curbside disposal. It quickly hardens latex and acrylic paints and stains so you can dispose of the solidified paint safely. You save time and effort than painting out or drying up and there is less mess too. No need to use newspaper, kitty litter, or sand. One 3. 5 oz. package hardens up to 2/3 of a gallon (2. 5L) in 15-20 minutes.