Thanks to Doityourself.com for these painting tips.
Remember: A coat of fresh paint will not glue down a coat of old paint that's ready to crack and fall off.
Paints are common coatings used on wood and provide the most protection. Latex-based paints and stains are water borne, and oil or alkyd paints are solvent borne. Paints are used for aesthetic purposes, to protect the wood surface from weathering and to conceal certain defects. Paints are applied to the wood surface and do not penetrate it deeply. The wood grain is completely obscured, and a surface film is formed. This surface film can blister or peel if the wood is wetted or if inside water vapor moves through the house wall and wood siding because of the absence of a vapor barrier.
Read more: http://www.doityourself.com/stry/exttips#ixzz21I1oFZ3i
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