Deck treatments that retain their appearance the longest
are the ones that are the most like paint. Widely advertised clear finishes don't
provide long-term protection.
Lumber, like skin, doesn't fare well when it's left unprotected. The sun's ultraviolet
rays are always on the attack. Rain and sun alternately swell and dry wood, eventually
causing it to crack and split. Moisture promotes the growth of mold and mildew.
Even redwood, cedar, and pressure-treated wood can benefit from a protective
coat. Our tests show that many clear deck treatments usually don't offer more
than a year of protection before their appearance has visibly degraded.
Major brands include Ace, Behr, Benjamin Moore, Cabot, Flood, Glidden, Olympic,
Sherwin-Williams, Sikkens, Thompson's, and Wolman. There are also many smaller,
Clear finishes are generally water-repellent, but they don't provide protection
from ultraviolet and visible light. They let the wood's natural grain show through
but allow the wood to turn gray. Semitransparent finishes contain some pigment
but still allow the wood grain to show. Opaque stains completely mask wood grain
and are also known as solid finishes. Price range: $10 to just over $50 per gallon.
Deck treatments may be alkyd-based (solvent) or latex-based (water). Most
alkyd-based products require cleanup
with mineral spirits, but a few can
be cleaned with water. Latex-based products clean up with water. Linseed oil
and tung oil, once common binders in wood coatings, have largely been replaced
by synthetic resins. These new formulations are described as preservatives,
protectors, stabilizers, repellents, sealers, cleaners, restorers, or rejuvenators.
HOW TO CHOOSE
Make an opaque treatment your first choice, as it retains its appearance the
longest. And because an opaque deck treatment should last for two to three years,
it's also more economical in the long run. After several coatings, however, an
opaque finish can build up a film layer that may require more extensive preparation--such
as scraping or sanding--for subsequent coats. Special precautions, such as the
use of goggles, gloves, and respirators, are necessary when scraping or sanding
pressure-treated wood due to the presence of toxic substances. Consider a semitransparent
treatment if you want the wood grain to show. Be aware that if you choose a clear
deck treatment, you'll likely be doing the job over again within a year.
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Copyright © 2003-2007 Consumers Union of U.S., Inc.
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