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Problems to Avoid
MOISTURE & PAINT
Outside moisture such as rain and dew can penetrated a paint coat result in cracking, peeling, discoloration and premature paint failure. These problems may be observed in both heated and unheated buildings, where water is held on the surface. Porous paints are particularly vulnerable to moisture penetration. .
Proper construction and maintenance will eliminated most exterior problems. Ice dams occur in cold northern climates when snow on the upper warmer parts of a roof melts and runs downward. As the melted reaches the roof overhang which is not heated, it freezes once more. With repeated thawing and freezing on the roof more water may penetrate paint problems.
Temperature blisters are bubble-like swellings that occur on the surface of the paint film as early as a few hours or as long as one to two days after painting. They occur only surface of the fresh paint and the liquid thinner in the wet paint under the dry skin changes to vapor and cannot escape. A rapid rise in temperature, as when the direct rays of the sun fall directly on freshly painted wood, will cause the vapors to expand and produce blisters. Usually only oil-based paint blisters in this way. Dark colors which absorb heat and thick paint coats are more likely to blister than white paints or thin coats.
To prevent temperature blisters, avoid painting surfaces that will soon be heated. The north side of the building should be painted early in the morning, the east side late in the morning, the south side well into the afternoon, and the west side late in the afternoon.