Prepare the pergola
Make sure the pergola is clean and dry before applying stain. You can use a soft brush or cloth to remove surface dirt or lightly hose off any wet areas and let it dry completely. You can also scrape off any loose or flaking stain with a wire brush or scraper.
Choose your tools
You can use a brush, roller, paint pad, or spray to apply the stain. For solid stains, you can use a brush or roller, but some recommend a high-quality brush over a cheap foam brush. You can also have a variety of brush and roller sizes on hand so you can use the most effective size for the job.
Apply the stain
Stir the stain thoroughly before and during application, and don't thin it. Apply the stain in the direction of the wood grain, and try to apply a few boards at a time to avoid lap marks. For clear, toner, and semi-transparent stains, apply one thin coat, and for solid stains, apply two thin coats. Backbrush into the surface to work the finish into the wood and ensure an even coating. Wipe away any drips or puddles right away.
Let it dry
Allow the stain to dry completely before replacing furniture or walking on the stained floor boards. Depending on the product you use, you might also need to wait 24–48 hours before exposing the pergola to precipitation.
You can also consider sealing the wood before assembling the pergola. To keep a cedar pergola's original color, you can apply fresh stain every couple of years.
