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Exterior
Preparation and Painting
As
with interior painting, proper surface preparation is crucial for
achieving a long lasting paint job. A thorough cleaning to remove
dirt and mildew is the first step in preparing exterior surfaces.
All loose paint and defective caulking should then be
removed. Any rotted boards should be replaced, and all new and bare
wood primed. Gaps between adjoining wood, or wood and masonry,
should be caulked with an elastomeric sealant. Hardware and light
fixtures which are not to be painted should be removed or properly
protected, and all plants should be moved or covered.
Rusty surfaces, such as steel lintels and wrought iron, may
require special preparation. All loose rust should be removed, and
the surface then primed with a rust inhibiting primer.
As
with interior paints, many manufacturers have developed new latex
products which offer superior performance over oil base paints. A
100% acrylic latex paint should be used for exterior surfaces. Less
expensive paints generally contain a vinyl, or vinyl-acrylic, resin,
which is not as durable as a 100% acrylic resin and does not retain
color as well.
Generally, paints offered for residential use are either
alkyd base (oil) or water base (latex). The base indicates the
solvent used to suspend pigments (coloring agents) and resins
(binding agents).
Because they dry slowly, alkyd paints should not be used for
exterior painting in warm, humid climates. The slow drying time
gives mold spores more opportunity to attach to the drying paint
film.
This, combined with the nature of the resins in alkyd
paints, provides a near perfect environment for mildew. Latex paints
are much more mildew resistant. While most high-quality paints now
contain mildewcides, such additives will only inhibit mildew growth,
not prevent its occurrence.
No
paint job will last forever. However, the life of paint can be
extended with the proper care and maintenance. Interior paint is
generally not subjected to conditions as harsh as exterior paint.
Maintenance usually consists of little more than occasionally
cleaning to remove dirt, grease, or fingerprints. Scuff marks,
scratches, and chips require touch up.
Exterior paint requires considerably more maintenance.
Regularly removing dirt and mildew will not only keep the paint
looking fresh, but will also prevent mildew growth from destroying
the paint film. In addition, an inspection for rotted wood and
cracked caulk should be conducted at least once a year.
Promptly replacing rotted boards and repairing cracked caulk
will prevent more extensive and expensive damage. |
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URBAN LEGENDS OF PAINTING
“Urban legends” are a type of folklore, i.e., popular stories that often have
some element of truth. However, they remain generally untrue, despite their
regular retelling. Similar stories exist regarding painting. We call these the
“urban legends” of painting. And unfortunately, some of these legends are
occasionally spread by painting contractors.
Urban Legend: Brushing or rolling paint is superior to spraying.
Fact: According to the Paint Quality Institute, an independent
organization dedicated to educating consumers and contractors,
“some people think sprayed paint will not adhere as well as
paint that is brushed, but we have not seen that, so long as
the surface has been properly prepared.” In addition, because
spraying generally produces a smoother finish, dirt and mold
spores are less likely to attach to the paint film.
Urban Legend: Larger painting companies have more overhead and
must charge higher prices.
Fact: While it is generally true that larger companies will
have more overhead, that doesn’t necessarily lead to higher
prices. In fact, a company with more employees can spread the
overhead over more field hours. For example, Company A has
weekly overhead of $1,000 and 3 people in the field, while
company B has $2,000 in weekly overhead and 7 people in the field.
Assuming each employee works 40 hours, Company A must charge $8.33
per hour to recover overhead while Company B must charge $7.14 to
recover its overhead. Of course, the actual overhead for each
company will be different.
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Philpaint provides professional interior and exterior painting services throughout Southwest Houston,
including the following communities: Bellaire, West University, Rice Village, Southampton, Montrose, The Heights,
Braeswood, Meyerland, Tanglewood, River Oaks, Sharpstown, and surrounding areas.
© Philpaint Incorporated 2008 All rights reserved.
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