To make whitewash, wear protective clothing and eyewear and soak 50 pounds of hydrated lime in 6 gallons of water to make 8 gallons of paste. Dissolve 5 pounds of dry calcium chloride or 15 pounds of salt in 5 gallons of water, then combine it with the paste. Mix until it is as thick as whole milk. Whitewash works best on rough, permeable surfaces for decorative purposes or to protect tree trunks from insects and frost.
Make a more traditional whitewash recipe by mixing 1 gallon of hydrated lime with boiling water. Strain it, then add 2 gallons of salt dissolved in warm water to 3 pounds of ground rice boiled to a thin paste. Add 1/2 pound of powdered calcium carbonate and 1 pound of clear glue dissolved in warm water, and mix. Let stand for several days. Reheat, and apply as hot as possible.
Alternatively, make a less-caustic whitewash using latex paint. Pour 2 inches of water in the bottom of a bucket. Add an equal amount of flat white latex paint, and mix with a stir stick or wooden spoon. Add more paint or water to thicken or thin the mix. Use this faux whitewash on almost any surface, including furniture and crafts; this lime-free version, however, is ineffective in protecting tree trunks.