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'''Painting stucco''' is the recoating of cement-based exterior plaster with acrylic or elastomeric masonry paint to refresh color, seal hairline cracks, and protect the shell of the house from water intrusion. Stucco takes paint well — it is one of the most paint-friendly [[Exterior Painting|exterior surfaces]] — but its texture drinks 30–50% more paint than smooth siding, and its network of hairline cracks must be repaired first or they will reappear through the new coat within a season.

== Know Your Stucco First ==

Traditional three-coat cement stucco is a masonry product: porous, alkaline, and breathable. Synthetic stucco (EIFS) is an acrylic finish over foam board; it is repainted only with 100% acrylic coatings, never cement products, and if you are unsure which you have, press on it — EIFS sounds hollow and gives slightly. This article addresses cement stucco; the principles overlap heavily with [[Painting Brick]] and [[Painting Concrete]] because all three are masonry.

'''New stucco must cure at least 28 days — and ideally 60–90 — before painting.''' Fresh stucco carries a surface pH of 12–13 as the cement hydrates. Paint applied too early is chemically burned (saponified), leading to blotchy color and early [[Paint Peeling|peeling]]. Test with a pH pencil or strips; below pH 10 with an alkali-resistant primer, or below 9 for direct topcoating, is the safe zone. If the builder's schedule forces earlier painting, use a mineral/silicate paint or a primer explicitly rated for hot (high-pH) stucco.

== Repairing Cracks Before Painting ==

Walk the whole house and sort cracks by width:

* '''Hairline cracks (under 1/16")''' — the most common stucco defect, caused by normal shrinkage and thermal movement. Brush clean, then fill with a paintable elastomeric or acrylic caulk (see [[Caulking]]), tooling it flat with a damp finger so it disappears under paint. On heavily crazed walls, skip spot-fixing and let an elastomeric coating bridge them all at once.
* '''Cracks 1/16"–1/4"''' — rout slightly, fill with sanded acrylic stucco patch, and texture-match by dabbing with a sponge or whisk broom before it sets. Let patches cure 7 days and prime them, or they will flash through the topcoat as dull spots.
* '''Cracks wider than 1/4", diagonal stair-step cracks, or soft/bulging areas''' — these signal structural movement or water damage behind the lath. Get a stucco contractor before painting; paint hides symptoms, not causes.

Also check kick-out flashings, window heads, and the weep screed at the base of walls. Painting over the weep screed is a classic mistake — it must stay open to drain the wall.

== Elastomeric vs. Acrylic Masonry Paint ==

{| class="wikitable" style="width: 100%;"
|-
! Factor
! 100% Acrylic Masonry Paint
! Elastomeric Coating
|-
| Film thickness || 2–4 mils dry || 10–20 mils dry
|-
| Crack bridging || Hairline only || Bridges cracks up to ~1/16" and stretches with movement
|-
| Breathability || Good (stays vapor-open) || Lower; quality products are rated "breathable" but still trap more moisture
|-
| Coverage || 150–250 sq ft/gal on stucco || 50–75 sq ft/gal
|-
| Cost per gallon || $35–$70 || $45–$90
|-
| Lifespan on stucco || 7–12 years || 10–20 years
|-
| Risk profile || Low; forgiving, easy recoat || High if applied to damp or cracked-to-daylight walls — trapped moisture blisters the sheet
|}

The honest rule: '''acrylic for sound stucco, elastomeric for crazed stucco in dry climates.''' Elastomeric is a specialty waterproofing membrane, not a premium version of house paint. Applied too thin it fails to bridge; applied over damp walls it [[Paint Bubbling|bubbles]]. In humid climates or on walls with any moisture history, high-build acrylic masonry paint is usually the safer system. Whichever you pick, use flat or low-lustre [[Paint Finishes|sheen]] — anything glossier spotlights every trowel mark.

Prime bare or patched stucco with an alkali-resistant masonry [[Paint Primer|primer]]; chalky old stucco (rub a hand across it — white powder means chalking) needs a penetrating masonry conditioner first, or the new paint bonds to the chalk instead of the wall.

== Spray and Backroll Technique ==

Stucco's texture makes brushing impractical for whole walls; the professional standard is '''spray plus backroll''':

# Wash the walls at 1,200–1,500 PSI, 45-degree angle, keeping the tip 16+ inches back, and let dry 24–48 hours.
# Mask windows, fixtures, and roof lines thoroughly ([[Masking and Taping]]) — airless overspray drifts.
# Spray with an airless unit (0.017–0.021 tip, roughly 2,000 PSI) in 50% overlapping passes.
# Immediately have a second person '''backroll''' the wet paint with a 1"–1-1/4" nap [[Paint Rollers|roller]], pushing paint into the valleys of the texture and evening the film. Spraying alone leaves pinholes in the recesses that become water entry points.
# Two coats, honoring the recoat window ([[Paint Drying Time]]). [[Cutting In|Cut in]] tight spots at [[Painting Trim|trim]] and eaves with a stiff nylon-poly [[Paint Brushes|brush]].

Work between 50°F and 90°F, never on sun-hot walls or when rain is expected within 24 hours — follow the wall's shade around the house ([[Best Temperature for Painting]]). Ladder work on textured walls is abrasive and awkward; review [[Painting Safety]] before starting.

Budget: a 2,000 sq ft stucco house typically takes 15–25 gallons of acrylic (double for elastomeric) — verify with [[How Much Paint Do I Need]]. Professional repainting runs $1.50–$4.00 per sq ft of wall area, commonly $3,000–$8,500 per house; see [[How Much Does Painting Cost]] and [[How to Hire a Painter]] for budgeting and bids.

== Common Mistakes ==

* Painting new stucco before the 28-day (minimum) cure, causing saponification and blotching.
* Skipping crack repair and expecting one coat of paint to hide a crazed wall.
* Choosing elastomeric for a damp or shaded wall and sealing moisture in.
* Spraying without backrolling, leaving pinholes and thin valleys.
* Applying elastomeric at normal-paint spread rates — it must go on 3–5× thicker to bridge cracks.
* Painting over chalking stucco without a bonding conditioner.
* Sealing the weep screed at the bottom of the wall.
* Pressure washing at 3,000+ PSI and gouging the finish coat.

== Frequently Asked Questions ==

=== How long should stucco cure before painting? ===
A minimum of 28 days, and many manufacturers and plasterers recommend 60–90 days in cool or damp weather. The real gate is alkalinity: paint when surface pH drops below about 10 with an alkali-resistant primer. Painting sooner risks burned pigment, blotchy sheen, and early peeling.

=== Is it better to roll or spray stucco? ===
Spraying with an airless sprayer followed immediately by backrolling is the best method — the sprayer delivers volume and the roller works paint into the textured valleys. Rolling alone works on small areas with a 1-1/4" nap roller but takes two to three times longer. Never spray without backrolling on the first coat.

=== Should I use elastomeric paint on stucco? ===
Use elastomeric only when the stucco is heavily hairline-cracked, the walls are fully dry, and you are in a relatively dry climate — it bridges cracks and waterproofs like a membrane. On sound stucco, or in humid regions, 100% acrylic masonry paint is more breathable, cheaper, and easier to recoat later. Elastomeric applied over damp walls is a leading cause of stucco blistering.

=== How often does stucco need to be painted? ===
Quality acrylic paint on stucco lasts 7–12 years; elastomeric systems 10–20. Sun-baked south and west walls fade first, and hairline cracks reappearing is usually the earliest sign a repaint is due. Washing the walls every year or two extends any coating's life.

=== How much does it cost to paint a stucco house? ===
Nationally, professional stucco repainting runs about $1.50–$4.00 per square foot of wall, so most single-family stucco homes land between $3,000 and $8,500 including minor crack repair. DIY materials for the same house typically cost $500–$1,200. Heavy elastomeric systems or extensive patching push costs toward the top of the range.

[[Category:Exterior Painting]]
[[Category:Painting Techniques]]
[[Category:House Painting]]

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