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Before you apply stain, make sure the surface is clean (no dust, dirt, wood fibers or grease), dry and free from mildew. When a surface is not clean, stains and other finishes have trouble sticking and may end up peeling.
You can remove dirt with warm water and detergent, but mildew problems require more. Removing mild mildew requires a mixture of one quart household bleach in three quarts of water.
Wear rubber gloves, long sleeves, and eye protection and quickly wash off any solution that touches your skin.
Rinse well with a hose, then let all surfaces dry thoroughly before you begin staining.
Untreated, New Wood
For untreated exterior wood surfaces, stain shortly after installation to help prevent wood deterioration, darkening or mildew growth — a common result of exposure to the elements.
Note: Be careful not to stain treated (green) wood until it has had a chance to "leach out" or weather. Ask an expert at Sherwin-Williams or at the lumber company where you bought the wood when the best time is to apply the stain.
Old Wood
For previously stained or painted surfaces in need of a solid color stain, be sure to remove all dust, dirt, loose and peeling paint and chalk deposits before getting started. (If you're applying WoodScapes semi-transparent stain to any previously painted surfaces, it's essential to first sand or scrape down to the bare wood.)
To sand wood smooth:
Use a medium grit paper at first. You can use coarse sandpaper on rough wood surfaces.
Finish the job with a fine grit paper to ensure the smoothest texture.
Be sure to use a protective dust mask.
Warning! Removal of old paint by sanding, scraping or other means may generate dust or fumes that contain lead. Exposure to lead dust or fumes may cause brain damage or other adverse health effects, especially in children or pregnant women. Controlling exposure to lead or other hazardous substances requires the use of proper protective equipment, such as a properly fitted respirator (NIOSH approved) and proper containment and cleanup. For more information, call (in the U.S.) the National Lead Information Center at 1-800-424-LEAD or contact your local health authority.
Next:
Replace any badly rotted boards.
Caulk around windows and doors to create a proper seal.
Check the wood's surface for any surface irregularities (cracks or holes) that need smoothing out with wood filler.
Spread out a drop cloth to protect your foundation, walkways, shrubs, planters and other yard items from accidental spills.
How much stain will I need?
To calculate how many gallons of product you will need, all you need is a tape measure and some simple math.
See Also:
WOODSCAPES® Exterior House Stains
Maximum durability and wood protection — guaranteed. Our high quality WoodScapes® protects and enriches wood's natural texture and grain.