Prior to application, the surface should be cleaned well with soap and water, followed by complete rinsing with water. If necessary, Isopropyl alcohol can be used for removing any residual soil, followed with additional soap & water, and water rinse. Make sure that surface is completely clean and dry before applying Davies’ Aircraft Boot Anti-Icer 100. The product is easy and economical to apply by wiping on with a cloth or tramp pad. A consistent single layer can be applied with a back and forth motion along the length of the boot. It is highly recommended that the Davies’ Aircraft Boot Anti-Icer 100 be reapplied after a maximum of 50 flight hours.