Waste Away Paint Hardener is an environmentally-friendly paint management solution that turns liquid paint solid for curbside disposal. Works with latex and acrylic paints and stains. Less mess and less effort than painting out or drying up. No need to use newspaper, kitty litter, or sand. Works great on spills too. Just mix, stir, and dispose of solidified paint. Hardens up to 2/3 of a gallon (2.5L) in 15-20 minutes.