A coat of house paint isn’t much thicker than a sheet of paper, yet it can effectively
resist extreme heat and cold, sunlight, rain and snow, chemicals and bacteria –
if applied properly. However, if the surface condition is poor and the application is poor,
the paint can’t perform up to it’s potential. Here’s some information to help you
understand more about painting and get the most out of your paint investment.
Oil-base Paints use linseed oil, alkyd resin or a combination as the binder. They are
thinned with paint thinner, not water. Oil-base paints have a thicker film than latex
paints which helps provide better hiding power. They produce better adhesion over
chalky, glossy or hard surfaces. However, oil-base paints tend to erode or wear down
faster than latex paints.
Latex paints use latex type materials as the binder and are thinned with water. The
dry latex film is thinner and more flexible that oil-base film and erodes at a slower
rate. Latex film has “breather” properties which help reduce moisture blistering. Latex
paints feature water clean-up of equipment, easy brushing, fast drying and superior
fade resistance. They can be applied over a slightly damp surface, such as painting
after a rain, while oil-base paints require a completely dry surface for painting.
Exterior wood surfaces expand and contract with changes in moisture and temperature.
The ideal paint film is sufficiently thin and elastic to move as the surface moves. To
maintain elasticity, prevent build-up, and provide a proper surface for the next coat of
paint, the paint film is designed to erode in a controlled manner while still protecting
the surface. The following normal painting cycles assume that quality products are
applied properly with normal exposure to the elements:
Oil-base paints – re-paint every 5 – 6 years
Latex house paints – re-paint every 6 – 8 years
Semi-transparent stains – re-coat every 2 – 3 years
Oil-base heavy bodied stains – re-coat every 3 – 4 years
Latex heavy bodied stains – re-coat every 4 – 5 years
The first application of stains on bare wood may require re-coating sooner.
It is best to re-apply the same type of paint when repainting although latex may be
applied over oil-base if the undercoat is in good condition. A qualified paint dealer can
advise you on the proper finish and whether a primer is needed. House paints may be
applied over most exterior stains unless the stain contains wax in the formula. When
painting over stain, primer is recommended. Aluminum and vinyl siding can be painted.
If the surface is badly deteriorated, a primer may be recommended followed by a finish
coat of latex paint.
Next – Part 2 – Primers, Preparation and Application
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