Products such as GenBor RTU-2 and Genics CuB 2-20 can be used by brushing or spraying. Coverage varies based on the type and dryness of the wood but typical coverage is about 200sq ft per gallon (18.6m3). Since these are water based products and contain no oil-based solvents or carriers the water can both freeze in the cold and flash off on hot, sunny days. Care should be taken to avoid both extremes during product application. Also, since these are very mobile in water it is important to cover with a water resistant sealer when applied in areas exposed to the weather.