Cedar is one of the best woods you can put on a house, and also one of the trickiest to paint. The same natural extractives that make it rot resistant are water-soluble tannins that migrate into fresh paint and leave brown or orange streaks within weeks. That is why painting cedar siding succeeds or fails at the primer stage. Clean the wood well, let it dry, seal it with a stain-blocking exterior primer, then top it with two coats of quality exterior acrylic paint, and a cedar wall can hold color for 10 years or more.
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Skip the primer, or use a thin latex primer that lets tannins pass, and you will be scrubbing streaks off the trim by the next summer. Painting over old peeling coats without proper prep causes a different kind of failure: the new paint lifts along with the old. Both problems are preventable with a little patience and the right products.
- Painting Cedar Siding vs Solid Stain
- Understanding Tannin Bleed
- Tools and Materials
- Prepping New or Bare Cedar
- Repainting Old Cedar Siding
- Primed Cedar Shakes and Pre-Finished Products
- Ladder Safety and Working Height
- Troubleshooting Paint on Cedar
- Costs and When to Call a Pro
- Frequently Asked Questions
Below you will find how to decide between paint and solid stain, how to prep new and weathered cedar, what to do with pre-primed shakes and how to handle repainting cedar siding that already has several coats on it.
Painting Cedar Siding vs Solid Stain
Before buying paint, decide whether a solid-color stain would serve you better. Both hide the grain, but they behave differently.
- Exterior paint forms a thicker film that resists dirt and gives crisp, even color. It suits smooth-planed lap siding and trim, and pairs well with a stain-blocking primer. Expect about 8 to 12 years between repaints on a well-prepped wall.
- Solid-color stain soaks in more and forms a thinner film that shows texture. It suits rough-sawn cedar and shakes, tends to wear rather than peel, and is easier to refresh. Plan to recoat every 5 to 7 years.
Painted cedar shakes have a classic, crisp cottage look, while solid stain keeps more of the rustic texture. If your shakes are rough and deeply textured, solid stain is often the more forgiving choice. If you want a clean, uniform color on smooth lap boards, paint wins.
Understanding Tannin Bleed
Cedar and redwood contain tannins that dissolve in water. When a waterborne primer or paint goes on, or when rain and humidity soak through the film later, the moisture carries those tannins to the surface, where they dry as tan or rusty stains. Knots and end grain bleed the most.
The fix is a primer formulated to lock tannins in. Traditional oil-based or alkyd exterior primers are the most reliable blockers. Some waterborne stain-blocking primers are also designed for tannin-rich woods; they usually work best with two coats. Whichever you choose, read the label and confirm it is rated for cedar and redwood. A stain-blocking exterior primer is the single most important product in the job.
Tools and Materials
- Stain-blocking exterior primer rated for cedar
- Top-quality 100 percent acrylic exterior paint (two coats)
- Wood cleaner or oxygen bleach cleaner, a soft brush and a garden hose (or a pressure washer used gently)
- Paint scrapers, a carbide scraper and 60 to 80 grit sandpaper
- Exterior paintable caulk and wood filler
- 4 inch brushes for siding, angled 2 inch brush for trim, and a sprayer if desired
- Drop cloths, painter’s tape and plastic sheeting for windows
- Moisture meter for wood
- Gloves, eye protection, and an N95 or P100 respirator for sanding
- Extension ladder with standoff, or scaffold
Prepping New or Bare Cedar
New cedar siding often has mill glaze, a slick surface from the planer that prevents good adhesion. It also degrades quickly in sunlight: just a few weeks of UV exposure weakens surface fibers enough to hurt paint adhesion. Prime bare cedar as soon as it is dry and clean, ideally within two weeks of installation.
- Clean the surface. Wash with a wood cleaner or oxygen bleach solution, scrub with a soft brush and rinse thoroughly. Lightly sand smooth faces with 60 to 80 grit to remove mill glaze.
- Let it dry. Wait until a moisture meter reads roughly 15 percent or lower, usually 2 to 3 dry days after washing.
- Back-prime if you can. If boards are not yet installed, prime all faces and cut ends to reduce cupping and moisture movement.
- Prime the face. Brush the primer into the grain, working the full length of each board to avoid lap marks. Spot-prime knots with an extra coat.
- Caulk and fill. After the primer dries, caulk vertical joints and trim gaps with exterior paintable caulk. Do not caulk the bottom edge of lap siding, which must drain.
- Apply two topcoats. Paint in shade when temperatures are between about 50 and 90°F and no rain is expected for 24 hours. Back-brush sprayed paint to work it into the texture.
Repainting Old Cedar Siding
Repainting cedar siding that already has paint is mostly a prep job. Older coats may be chalking, cracking or peeling, and the new paint can only perform as well as the layer beneath it.
- Test for lead first. If the house was built before 1978, test the existing paint for lead before scraping or sanding. If it is positive, use lead-safe work practices (wet scraping, plastic sheeting, HEPA vacuum cleanup) or hire a lead-safe certified contractor. Older homes may also have asbestos-containing siding or shingles under or near the cedar; have suspect materials tested before you disturb them.
- Wash. Clean off chalk, mildew and dirt with a wood or house cleaner and rinse. A pressure washer on a low setting with a wide fan tip works, but keep it moving and never gouge the wood.
- Remove loose paint. Scrape all peeling and lifting areas. Feather the edges with sandpaper so the patches will not telegraph through.
- Spot-prime bare wood. Every bare spot, knot and stain mark gets stain-blocking primer. If tannin streaks show through the old paint, prime those areas too.
- Repair and caulk. Replace split or rotted boards, fill holes and recaulk open joints.
- Topcoat. Apply two coats of exterior acrylic paint over the entire wall.
Primed Cedar Shakes and Pre-Finished Products
Primed cedar shakes arrive with a factory primer already applied, usually on all sides. That saves a lot of time and gives better protection than field priming one face. Treat the factory coat as a base, not a finish: most makers ask you to apply topcoats within a set window (often 6 months to a year), because UV exposure degrades the primer. Clean the shakes, spot-prime any field cuts and dings with a compatible stain-blocking primer and finish with two coats of exterior acrylic paint or solid stain.
Painted cedar shakes need a little extra care. Their textured faces and many shadow lines hold more paint, so plan on more product than for flat lap siding, and back-brush or back-roll after spraying so paint reaches every groove and the butt edges.
Ladder Safety and Working Height
Most siding work happens from a ladder, and that is where most injuries happen too. Set an extension ladder on firm, level ground at about a 4 to 1 angle, extend it 3 feet above any landing and use a standoff to keep it off the siding and gutters. Keep three points of contact, move the ladder instead of overreaching, and never set it near overhead power lines. For two-story walls or steep yards, rent scaffold or pump jacks, or hire a painter with the right equipment.
Troubleshooting Paint on Cedar
Brown streaks after painting
That is tannin bleed. Let the paint cure, wash the area, then apply a stain-blocking primer over the streaks and repaint.
Peeling within a year or two
Common causes include painting over mill glaze, UV-degraded wood, damp boards or a moisture source behind the siding such as missing flashing or a leaking gutter. Fix the moisture first, then scrape, prime and repaint.
Mildew spots
Wash with a mildew cleaner, rinse and let dry before painting. Trim back shrubs so the wall can dry.
Blistering
Blisters form when paint goes on in direct sun or over damp wood. Scrape, let dry, prime and repaint in shade.
Costs and When to Call a Pro
Materials for a typical single-story house often run several hundred to around $1,500 for quality primer and paint. Professional exterior painting of cedar siding commonly lands in the range of $3 to $7 per sq ft of wall, with heavy scraping, lead-safe work and tall walls pushing costs higher.
DIY works well for a single-story home with sound siding. Hire a professional painter for two-story walls, homes with lead paint, extensive rot or failing paint across large areas, and situations where moisture problems behind the siding need diagnosis. A good contractor will also have the sprayers and staging to finish the job in days rather than weekends.
Frequently Asked Questions
Do you have to prime cedar before painting?
Yes. A stain-blocking exterior primer is essential, because it seals tannins that would otherwise bleed through and stain the paint.
Can I use latex primer on cedar?
Only if it is specifically labeled as a stain-blocking primer for tannin-rich woods like cedar and redwood. Oil-based exterior primers are the traditional choice.
How long does paint last on cedar siding?
With good prep and two quality topcoats, paint on cedar often lasts 8 to 12 years. Sun-exposed walls may need attention sooner.
Should I paint or stain cedar shakes?
Paint gives crisp, uniform color and suits smooth shakes. Solid stain keeps more texture, wears more gradually and is easier to refresh on rough shakes.
When should I paint new cedar siding?
Prime and paint within about two weeks of installation, once the wood is clean and dry. Long sun exposure weakens the surface and reduces paint adhesion.
