How to Finish Cedar for Outdoor Use: 1 Minute to a Beautifully Protected Outdoor Cedar Finish

Cedar is naturally durable and resistant to decay, making it a popular choice for outdoor projects like decks, furniture, siding, and fences. However, to maximize its longevity and aesthetics, it’s essential to apply the right finish. Here’s a comprehensive guide to finishing cedar for outdoor use—designed to give your outdoor cedar projects protection against moisture, UV rays, and weathering while enhancing their natural beauty.

Step-by-Step Guide to Finishing Cedar for Outdoor Use

1. Surface Preparation

Begin by cleaning your cedar surface. Remove dirt, mildew, or old finishes using a scrub brush, mild detergent, and water. For new cedar, sanding with 120- or 150-grit sandpaper will help open the pores, making the wood more receptive to finishing products.

2. Choosing the Right Finish

There are several finishes suitable for cedar outdoors, each with its pros and cons:

1. Clear finishes (Sealers or Water Repellents): These allow the natural color and grain to show but offer minimal UV protection. They need to be reapplied frequently (every 1–2 years).
2. Penetrating oil stains (Semi-transparent): These are a popular choice as they provide a slight tint that enhances the wood’s appearance while offering moderate UV shielding. They won’t peel or blister and generally last longer than clear sealers.
3. Solid color stains or paints: If you want maximum UV protection and color uniformity, these are the most durable options. However, they hide most of the wood’s character and require more intensive prep to ensure good adhesion.

3. Application

Always apply finishes when temperatures are moderate and rain is not expected:

1. Use a brush, roller, or sprayer for application; brushing often yields the best penetration.
2. Apply the product evenly, working with the grain.
3. Follow the manufacturer’s recommendations for drying and recoating times.

4. Maintenance

Inspect your cedar yearly. Reapply your chosen finish at recommended intervals or when you notice fading, water not beading on the surface, or increased surface roughness. Proper maintenance extends the life and appearance of your outdoor cedar.

As a designer, I always consider not only how a finish will perform, but how it impacts the look and longevity of my outdoor spaces. Choosing the right treatment technique can enhance your cedar’s warmth and texture, bring color harmony to your overall exterior palette, and integrate home designer principles directly into your woodworking projects, ensuring both function and beauty outdoors.

Tips 1:

Before committing to a finish, test it on a piece of scrap cedar or an inconspicuous area. This ensures the color and sheen match your expectations. Also, always opt for outdoor-rated products to guarantee protection against the elements.

FAQ

Q: Can I leave cedar unfinished outdoors?

A: Yes, but it will gray and may develop surface checks over time. Finishing helps preserve color and slows weather-related wear.

Q: What’s the longest-lasting finish for outdoor cedar?

A: Solid color stains or high-quality exterior paints typically last the longest, offering the best UV and moisture protection.

Q: How often should I reapply finish on outdoor cedar?

A: Clear sealers may need annual application; semi-transparent stains can last 2–3 years, while solid stains/paints may last up to 5 years depending on conditions.

Q: Can I paint over stained cedar?

A: Yes, but the surface must be thoroughly cleaned and sanded before applying a suitable exterior primer and paint for best adhesion.

Q: Is power washing safe for cedar before finishing?

A: Yes, but use low pressure to avoid damaging the soft wood fibers. Allow wood to dry thoroughly before applying finish.