Wilt-Pruf® Concentrate, 1 Gallon (3.8 Liters)Brand: Wilt Pruf Features: LONG LASTING. As the outside layer wears off and powders away, another layer forms. This process continues until all the layers have worn off which takes 3 to 4 months depending on climatic conditions EASY TO APPLY. Just mix, spray, and let dry YEAR ROUND moisture loss prevention for more than 60 years ORGANIC, BIODEGRADEABLE, NON TOXIC, non hazardous, and not impacted by harsh storage conditions (e. g. freezing) DRIES CLEAR