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Paint can only be applied to a clean surface. Grease and dirt should be completely removed by washing the surface with water and a non-soapy cleaner, as soap leaves a thin film on the surface to interfere with the action of the paint. A cloth soaked in turpentine can be used to wipe off a surface before painting. If the surface has been previously painted, and the paint is still in good condition, cleaning is all that is necessary before applying the new coat. If the old paint has cracked or blistered, scrape or sand it off. Moisture will spoil any painted surface. The surface must be absolutely dry, with no possibility of moisture seeping through from the opposite side and penetrating beneath the paint. After a rain, no outside painting should be done for several days, so that the wood will dry completely. It is equally important not to do any outside painting in the early morning when there is dew on the surface or late in the afternoon or early evening when the dew is gathering. Temperature must be considered as well. Do not attempt to paint if the temperature is less than 50 degrees F., as the cold will cause the paint to thicken and not flow properly. It is a waste of time and money to paint when conditions are not favourable.
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