How to Paint a Stucco Exterior, Step by Step, and When to Call a Pro

Painting stucco is not hard in the way that painting trim is hard. It is hard in the way that moving a piano is hard: the technique is simple and the job is heavy, high and unforgiving of skipped steps. Here is the order of work we follow on every stucco exterior in San Diego County, written so you can do it yourself on a single-story house in good condition, and so you can tell when the job has grown past that.

What you need

• Pressure washer, or a hose with a stiff brush and patience
• Elastomeric patching compound or sanded acrylic caulk for hairline cracks, and stucco patch for anything larger
• Masonry primer, and a bonding primer if the wall chalks
• A quality 100% acrylic exterior paint, flat or low sheen, mildew resistant
• Airless sprayer, or a 3/4 to 1 1/4 inch nap roller sized to the texture, plus a roller frame on a pole
• Painter's tape, plastic sheeting, drop cloths, and a ladder rated for the height
• A dark rag for the chalk test, and a garden sprayer for the water test

Buy more paint than the label math says. Textured stucco takes 30 to 50 percent more than smooth siding, and the second coat is not optional.

Step 1: Inspect the walls before you buy anything

Walk every wall in good light. Rub a dark rag across the surface: a white or colored film means the old paint is chalking and needs a bonding primer. Tap along the base of walls and around windows: a hollow drumming sound means the stucco has separated from the lath, and paint will not hold it on. Map the cracks. Anything up to about a sixteenth of an inch is hairline and cosmetic. Wider cracks, and cracks that step diagonally from window corners, are movement, and they need stucco repair rather than caulk. White powder blooming on the surface is efflorescence, which means water is moving through the wall from behind.

If the house was built before 1978, assume the old paint may contain lead until it is tested. Sanding or pressure washing lead paint without containment is a hazard to you and your neighbors and is regulated work. That alone moves the job to a licensed contractor.

Step 2: Wash, then wait

Pressure wash from the top down at a pressure that cleans without gouging the texture, or scrub with a brush and hose. Treat mildew on shaded walls. Then let the wall dry all the way through, not just on the surface. Inland, in El Cajon or Santee in summer, that can be one day. On the coast, where the marine layer sits on walls until noon, give it two. Paint over a damp wall and the moisture pushes the coating off from behind within a season.

Step 3: Repair the cracks

Fill hairline cracks with elastomeric patching compound or sanded acrylic caulk, then dab or stipple the patch so its texture matches the wall. A smooth patch on a rough wall shows through two coats of paint. Cut out and re-stucco anything wider, and if a crack is wider than a quarter inch or follows a stair-step pattern, stop and have someone look at what is moving underneath before you cover it. Let repairs cure for the time on the product label.

Step 4: Prime where it is needed

New stucco needs at least four weeks to cure and then a masonry primer that tolerates fresh cement's alkalinity. Previously painted stucco in sound condition usually needs primer only on patches, bare spots and chalky areas. Prime those and let the primer dry fully.

Step 5: Mask, then spray and back-roll two coats

Mask windows, doors, light fixtures, meters and hose bibs. Cover the roof edge, walkways, plants and any car within reach of overspray, which travels farther than you think.

The best finish on stucco comes from spraying with an airless sprayer and then rolling each section while it is wet. The spray lays the paint on fast; the roller pushes it into the texture so the coating is continuous instead of resting on the high points. If you are rolling only, use the thicker nap and work in sections small enough to keep a wet edge. Apply two full coats, waiting the label's dry time between them.

Watch the weather. Do not paint a wall in direct afternoon sun, when it is hot enough to flash the paint before it levels, or within 24 hours of rain, or on a coastal morning before the wall has dried. Most exterior acrylics want the surface between about 50 and 90 degrees.

Step 6: Clean up and check the work

Pull the tape while the last coat is still slightly soft so it does not tear the film. Walk every wall in low, angled light looking for holidays, the thin spots where texture shows through, and touch them up. Wash tools with water before the paint sets.

When DIY stops making sense

Any one of these moves a stucco repaint from a long weekend to a licensed contractor's job:

• Two stories, or any wall you cannot reach from a stepladder on flat ground
• Heavy chalking across the house, which means the whole surface needs a bonding primer applied correctly
• Cracks wider than a sixteenth of an inch, stair-step cracks, hollow areas or efflorescence
• A house built before 1978, until the paint has been tested for lead
• A color change that an HOA or architectural review committee has to approve, common in Eastlake, Otay Ranch and many East County communities
• Coastal exposure, where the wrong product or a wet wall fails fastest

What a licensed contractor's version of this looks like

The steps are the same. What changes is that they are written down. Our stucco jobs start with the inspection in Step 1, and what we find goes into a line-item written proposal: the wash, each repair by location, the primer and paint by product and sheen, two coats, the surfaces included and excluded, protection, cleanup and schedule. Anything that shows up after the wash is handled by a written change order before it is fixed. Company supervisors run the crew, and the job closes with a walkthrough you sign. We hold CSLB license #803527, classification C-33, which you can verify on the CSLB site, and the insurance on the job is stated on the proposal. Read more about our stucco painting and repair work, or the longer guide to painting a stucco house in San Diego.

Frequently Asked Questions

Do you need to prime stucco before painting?

New stucco, yes, always, after it cures. Painted stucco in good condition needs primer only on patches, bare spots and chalky areas.

Is it better to spray or roll paint on stucco?

Spray and then back-roll while wet. Spraying alone leaves paint on the high points of the texture; rolling alone is slow and uses more paint. The combination gives a continuous film.

Can you repaint stucco that has already been painted?

Yes, as long as the old paint is bonded. Wash it, test for chalk, spot-prime repairs and chalky areas, and apply two coats of acrylic. Old elastomeric needs a compatible product on top.

How long should new stucco cure before painting?

At least four weeks, and some manufacturers ask for longer. Painting before the cement has cured burns the paint off in patches.

How often should a stucco house be repainted?

Every seven to ten years for a quality acrylic job on sound stucco in San Diego. Sun-facing dark colors and salt-exposed coastal walls need it sooner.

How much does it cost to have stucco painted?

It depends on size, height, the condition of the stucco and how much repair is needed, so we price it from a site visit rather than from the curb. Our post on exterior painting costs in San Diego explains what moves the number.

If the list above has moved your job into contractor territory, request a free estimate and we will inspect the walls, disclose what we find, and price the work line by line. Or call (619) 432-3821.