SPRING DECK PREPARATION AND REFINISHING TIPS

It will soon be spring! Before you move the patio furniture back out to the deck, make sure you clean, restore and protect your deck so you can get the most out of it during the spring and summer months ahead. Here are some deck prep tips from the experts at Wolman Wood Care Products:

Clean the deck thoroughly to remove embedded dirt, fungus stains and gray surface wood with a formulated deck cleaner. The weathered gray wood left behind from last year's sun exposure, black or green stains from mildew, moss and algae, or brown-black tannin bleed common on new Cedar can ruin the look of your deck. Even newly built decks can require cleaning to remove invisible surface barriers like mill glaze on new Cedar or excess wax on pressure-treated wood. These invisible barriers can prevent the adhesion of protective coatings.

Procedure

  • Cover and / or hose down all surrounding landscaping -- grass, plants and vegetation -- before and after using a wood cleaner or stain-stripping product.
  • Do not use chlorine bleach (sodium hypochlorite) alone to clean / restore outdoor wood. It will interfere with a coating’s adhesion and penetration, and will not completely remove ground-in dirt or the weathered gray surface fibers that make the surface look aged and soiled. Products specifically formulated to a) loosen and lift degraded surface fibers and other surface contaminates, and b) remove stains from wood extractives and fungal growth are recommended for optimal surface restoration.
  • Dark stains found on Cedar and Redwood surfaces are most often the result of tannin bleeding, which can be remedied. Tannin is just one type of organic material that occurs naturally in decay-resistant species, and can be extracted to the surface by certain solvents, including water. Because tannin is water-soluble, mild discoloration can often be removed with detergent and water. Stubborn tannin stains can be removed with an oxalic acid-based wood cleaner.
  • ALWAYS perform a "Splash Test" before applying a new coating or a maintenance re-coat. Splash water on several sections of your wood structure, and observe if the water is absorbed. If the water beads or is not absorbed within 15 minutes, the surface will not absorb a coating properly. Use a wood cleaner / restorer to remove the repellency or allow the wood to weather for several weeks, then test again. Cleaning or weathering will allow the wood pores to open and better absorb the coating.

Once the wood is restored and your deck is rid of any surface barriers or unwanted finishes, it should be sealed with a protective water repellent finish. You may want to apply a semi-transparent stain to enhance your deck's appeal, or a transparent finish to let the natural wood color and texture show through. But, even if you are undecided on whether or not to stain - or on the deck color - it's important, at minimum, to protect it with a clear water repellent. Water repellents stop spring showers from penetrating the wood surface, which can cause swelling, shrinking, warping and cracking. Many water repellents, also contain a mildewcide that will impede the growth of mildew on your deck during the warm months ahead. Look for products, that offer a guarantee on water-repellent longevity, as they will provide longer lasting protection so you won't have to apply a new coat every year.

Products

  -Features that you should look for in the products you use:

  • Any coating that is "clear", i.e., without pigment, will not provide protection against UV exposure. A finish coating must contain pigment in order to block, absorb or reflect damaging UV rays. Coating pigment protects your wood's surface much like sunblock lotion protects your skin: both prevent the top surface layer from drying out and aging prematurely.
  • When dry, oil-base products will provide a deeper, shinier finish on the wood surface, while water-base products produce a flat, or matte appearance. Be sure to follow the product label's directions on recommended number of coats, so that you achieve the product's intended finish look.

  -Look for the recommended uses in the products you choose:

  • To protect wood decks or other structures exposed to constant shade, which promotes the growth of mildew, consider using a water-repellent coating with a preservative. The preservative will give added protection against fungal growth, including mildew, mold, rot and decay organisms.
  • To protect wood decks or other structures exposed to severe heat and sun exposure, use an acrylic stain with transparent iron oxide or opaque pigments. Coatings with this make-up will provide longer color retention than transparent stains or toners, giving your wood maximum protection against graying and surface degradation.

Application

  -Job Preparation

  • Remove BBQ grease from the deck surface before applying a coating. Automotive degreasers or carburetor cleaners (water-rinseable) are effective in removing these grease stains.
  • Mix multiple gallons of the same colored product together in a larger container to safeguard against color variation between gallons. This is especially important if product was purchased at different times or from different store locations.
  • Always do a sample brush-out to observe the appearance of your coating on your specific project surface. A coating’s color and sheen level will vary depending on a wood’s age and species, surface porosity and the method of application.

  -Procedures

  • Do not apply a coating immediately after a rainfall. Water-soaked wood should be dry out for 24 hours so that it can absorb a penetrating coating properly. For best results, apply coating when precipitation-free weather is expected 24-48 hours before the project begins and after it is completed.
  • Avoid applying finish coatings during the hours of most intense sunlight, if at all possible. Direct sun coupled with a hot surface can cause coatings to dry with an uneven appearance. If applying a water-base coating to wood that is hot to the touch, dampen with water to cool.
  • Do not over-apply a finish coating. Wood pores operate similar to a sponge; they can only absorb so much of a coating before they become saturated. Over-application will cause excess product to sit on the wood surface, which will lead to problems with tracking and premature failure.
  • It is not necessary to coat the underside of wood simply to protect it. The underside is not subjected to sun or significant water exposure, therefore, it does not require a protective barrier coating. Additionally, if it is pressure-treated wood, it will prevent invasion of wood boring insects and rot and decay organisms.
  • Remove any over-spray, drips or splashes before they dry to make clean-up easier. Wet product can be cleaned up with fresh water in most cases. If product has dried, use mineral spirits, lacquer thinner or a spot remove such as Simple Green, Gunk or Goof Off . See the Product Technical Data Sheet for your chosen coating for specific Clean-up instructions.

  -Compatibility

  • Do not apply a water-repellent sealer over an existing paint or stain. A water-repellent product must penetrate into the wood to perform effectively, and will not be able to penetrate an existing coating.
  • Do not tint or thin products, unless directed to do so on the product label. Altering a coating without specific label instruction will void its warranty. 
  • Similar colors of the same product may be combined to create a new shade.

Maintenance Tips

  • If water puddles sit on a deck or porch for more than two days, brush them off. Standing water can cause mildew to form on the surface of a coating.
  • Pitch stains, or crystallized sap, found mainly around the knots of pressure-treated wood, can be removed with turpentine or simply scraped away. Turpentine will not harm an existing coating. Pitch is a non-water soluble, organic wood extractive material found in species such as Ponderosa, Southern and White Pine.
  • Do not use a metal shovel to remove snow from a deck; it can pierce the underlying coating and cause it to erode.
  • Only use sodium chloride (i.e. Halite) types of salt on a wood deck or porch that has been water-sealed or stained. Calcium chloride salts will reduce the effectiveness of a water-repellent coating.

Wolman wood cleaners, strippers and water repellent finishes are a great choice to refinish your deck. You can call the company's technical service department at (800) 556-7737. Or, visit the Wolman web site at www.wolman.com for more helpful deck care tips.

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