Penetrate deep into wood surfaces to kill mold and mildew and restore a natural look to grayed and weathered decks and fences. Ideal for wood preparation before water sealer application. Sold as a powder, so you can make it strong enough for any job. Sprinkle on to a wet surface and brush or roll on .One 4 pound pail can make 10 gallons of solution Mixing: Mix 6.5 ounces per gallon of warm water. A blue color will appear. Continue to stir, as product is mixed, color will fade and solution will increase in viscosity. When all color is gone, mixture is ready to use. This mixture should be used within 6 hours.