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The requirements for painting over a painted surface vary according to the condition of the old paint. Paint that is discoloured but otherwise sound can be given two coats of new paint, unless a change in colour is desired. In this case, three coats will be necessary. The old paint should be washed, and any rough spots sanded smooth before painting. It is often found, on examining an old painted surface, that there are spots where the paint has blistered but the finish otherwise unimpaired. It is not necessary to remove all the paint in this case. Remove the cracked and blistered paint with a putty knife or paint scraper. sand down the paint surrounding the area and give the wood three coats of paint, allowing each coat ample time to dry before brushing on the next. In this way, you will build up the surface of the unpainted area until it is level with the surrounding paint. Finally, give the entire surface two coats of paint. It requires an experienced painter to determine whether a surface has so deteriorated that it should be removed, or whether the blisters and peeling are only a local condition and the rest of the paint is sound. When in doubt, it is best to assume that the entire surface is impaired; do not risk painting over it. Exterior woodworkIn painting the exterior of a building, take care that all woodwork around the windows is fully covered. This is a difficult and tiresome job, and the amateur is likely to skip over it as quickly as possible. The woodwork in a window sash is as exposed to the weather as any other portion of the building and should receive equal attention. Use a small sash brush for this delicate work, and if paint should get on the glass, wipe it off with turpentine before it dries. Thin metal plates can be purchased at hardware and paint stores, and by holding these against the glass, you can do neat work. Tape can also be used to keep the glass free of paint. Exterior woodwork close to, or in direct contact with, the ground should be given special consideration. Wash off all dirt before painting and be sure that all four sides are painted-not merely the side exposed. PorchesPorch floors and steps should not be painted with the same type of paint used for other exterior work. If the floor and steps are protected from the weather by an enclosed porch, cover them with a good grade of floor paint. If the porch is open, use a paint made for exposed surfaces that both withstands weather and resists wear and tear by shoes.
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