Wilt-Pruf from Wilt-Pruf Products sprays dries to form a clear transparent and flexible protective coating without interfering with plant growth or materially affecting respiration, osmosis, or photosynthesis. it is a natural pine oil emulsion that is non-hazardous, organic and biodegradable. It is not damaged by freezing during storage, it has an indefinite shelf life, and is non-toxic to eyes and skin.