Brick and stucco look like they should take any primer that works on a bedroom wall. They do not, and the reason is chemistry and water, not texture. Fresh masonry is alkaline enough to break down the binder in an ordinary latex primer, and it can stay damp inside for weeks, so a primer that is perfect for drywall can blister or peel off a new stucco wall within a season.
The useful question is therefore not which brand is best. It is what condition your wall is in and how long ago it was built or last painted. This guide works from the manufacturers’ own data sheets and product pages, mainly KILZ and Sherwin-Williams, and sorts the choices by surface condition. It also compares the waiting times each product asks for, because those differ far more than most people expect, and it ends with the coverage arithmetic for a real wall. If your problem is water coming through a basement wall instead, the foundation waterproofing sealant guide covers that case, since paint is the wrong tool for it.
Match the primer to the condition of the wall
Start with this table, then read the sections below for the reasoning and the numbers behind each row.
| Your wall | What the manufacturer says to use | Wait before coating |
|---|---|---|
| New brick, stucco, block or concrete | An alkali-resistant masonry primer such as Sherwin-Williams Loxon, or a self-priming masonry paint rated for high pH | 7 days for Loxon, 30 days for KILZ masonry paint |
| Old, sound masonry that was painted before | KILZ 2 All-Purpose, or the KILZ self-priming masonry paint on its own | Clean and dry, no cure wait for aged masonry |
| Glazed brick, glossy paint or chalky paint | A bonding primer such as KILZ Adhesion | Topcoat within 30 days of priming |
| Small job, sound surface, no stains | Self-priming masonry paint, two coats, no separate primer | 30 days if the masonry is new |
Why masonry needs different handling
Cement, mortar and stucco are strongly alkaline when they are new. A primer whose binder is not built for that alkalinity can lose adhesion, which is why products aimed at masonry advertise a pH rating. KILZ’s data sheet for its Masonry, Stucco and Brick paint says it is alkali-resistant up to pH 12.0. Sherwin-Williams says Loxon tolerates the high pH common in new masonry and prevents alkali in the substrate from harming later coats. Neither claim means a product will survive a wall that is still wet inside, so the waiting times below matter as much as the label.
The second difference is porosity. Brick and unsealed stucco soak up the first coat, so the thin, blotchy look after priming is normal, and the coverage printed on the can is a best case rather than a promise. Plan on the low end of every coverage range in this guide.
The waiting times do not agree, so read your own label
I read the cure-time instructions on four products and the spread is wide. The figures come from each manufacturer’s own pages and data sheets.
| Product | Minimum age of new masonry | Earliest paint date if the masonry was finished 12 October |
|---|---|---|
| Sherwin-Williams Loxon Concrete and Masonry Primer/Sealer | 7 days | 19 October |
| KILZ 2 All-Purpose Primer | 30 days | 11 November |
| KILZ Masonry, Stucco and Brick paint | 30 days | 11 November |
| KILZ Original oil-based primer | 90 days | 10 January |
KILZ’s own Original page adds a useful escape route: if the masonry is younger than 90 days, it points you to KILZ 3 Premium, KILZ 2 or KILZ Original Low Odor instead. The gap between 7 and 30 days is real, and I would not read it as one brand being wrong. These are different products with different binders, and each sets its minimum for its own chemistry. The practical rule is simple: use the number printed on the product you actually buy, and never mix one brand’s wait with another brand’s can.
Prep that decides whether any of this holds
- Wash and dry. KILZ’s data sheet calls for removing dust, chalk, oil, grease, mold and mildew, and loose or peeling paint. Power washing is the usual way to remove chalk, and the wall must then dry before you prime.
- Treat efflorescence. For new stucco, KILZ says to clean with one part vinegar to one part water to remove efflorescence and neutralize the surface. A white powder that keeps coming back means moisture is moving through the wall, and paint will not stop that.
- Give smooth concrete some tooth. The same data sheet says smooth masonry may need a profile for adhesion, made with an etching product or by mechanical means.
- Fill cracks first. Hairline gaps and failed mortar joints should be repaired before coating, using the methods in the concrete crack filler guide.
- Check the temperature. KILZ 2 lists 50 to 90 degrees Fahrenheit for surface, air and product temperatures.
For glazed, glossy or chalky surfaces: a bonding primer
Some masonry is hard for paint to grip rather than hard on the binder. Glazed brick, old glossy paint and chalky paint are the common cases. KILZ Adhesion is a bonding primer that its page lists for brick, concrete, cinder block, masonry and stucco, and for tough surfaces including glazed brick, chalky paints and glossy finishes. It covers 300 to 400 square feet per gallon, dries to the touch in 30 minutes, can be recoated after an hour at 77 degrees and 50 percent humidity, and should be topcoated within 30 days. KILZ recommends testing adhesion on a small area first.
One honest limit: the KILZ Adhesion page does not make an alkali-resistance claim. That makes it a good fit for sound, aged or glossy surfaces and a poor first choice for a wall that is only a few weeks old.
Check price on Amazon: KILZ Adhesion Primer (1 Gallon). This is an affiliate link (see our disclosure for details).
For old, sound masonry: KILZ 2 or no primer at all
KILZ 2 All-Purpose lists brick, stucco, plaster, cinder block, masonry and concrete. Its page says it may be used on clean, dry, aged masonry and that new masonry must cure at least 30 days first. It covers 300 to 400 square feet per gallon and dries to the touch in 30 minutes. It blocks light to medium stains, so it is the better pick when an old wall has water marks or discoloration to hide. It is not recommended for flooring, and the page makes no alkali-resistance claim, so keep it for aged walls.
For a small job: self-priming masonry paint
If the surface is sound and you are changing colour or refreshing a tired finish, a self-priming masonry paint skips a step. KILZ Masonry, Stucco and Brick paint is an acrylic latex, interior and exterior, mildew resistant and alkali-resistant up to pH 12.0. Its data sheet gives 250 to 400 square feet per gallon, touch-dry in 2 to 3 hours, recoat in 4 hours and a full cure in 2 weeks. It says it is for vertical surfaces and not for horizontal surfaces that take foot traffic. It also requires masonry to be cured at least 30 days before painting.
Check price on Amazon: KILZ Self-Priming Masonry, Stucco and Brick Paint (1 Gallon). This is an affiliate link (see our disclosure for details).
What a dedicated alkali-resistant primer looks like
When the wall is new and you want a separate primer under the paint, the specialist product is Sherwin-Williams Loxon Concrete and Masonry Primer/Sealer. Its page says it seals and adheres to concrete, brick, stucco and plaster, wants masonry at least 7 days old, and is meant for above-grade masonry. It comes flat in white, in 1 and 5 gallon sizes. A direct Amazon search for Loxon on 12 October 2026 returned no Sherwin-Williams listing, so this is the one item here you would buy at a paint counter instead.
How much to buy: the arithmetic for a real wall
Take a brick wall 24 feet long and 9 feet high. That is 216 square feet. Subtract a 3 by 7 foot door (21) and two 3 by 4 foot windows (24 in total) and you are painting 171 square feet.
| Step | Working | Result |
|---|---|---|
| One coat of primer at 300 to 400 sq ft per gallon | 171 divided by 300, and by 400 | 0.57 to 0.43 gallon, so 1 gallon |
| Two coats of masonry paint (342 sq ft of film) | 342 divided by 250, and by 400 | 1.37 to 0.86 gallon |
| Porous brick, plan on the low end | 342 divided by 250 | 1.37 gallons, so buy 2 |
That gives two routes. Primer plus two coats means 1 gallon of primer and 2 gallons of paint. Self-priming paint on its own, two coats, means the same 2 gallons of paint and no primer, which saves a whole gallon of primer on a wall this size. Mortar joints add surface area, so lean toward the larger figure if the brick is rough or deeply raked.
When paint is the wrong answer
Do not paint over a wall that is actively wet. If efflorescence keeps returning, if the wall is below grade, or if water is seeping through, fix the water first. A masonry coating is meant for above-grade surfaces, and a leak behind it will push the coating off. Think carefully before painting brick at all, because removing paint from brick later is slow and destructive. Painting makes the most sense when the brick is already painted, mismatched or stained beyond cleaning.
Etienne Basson maintains and repairs his own home, and writes practical guides on choosing the right materials and products for repair and finishing jobs: fillers, sealants, adhesives, and similar. He focuses on what actually works for a specific job, not just a spec sheet.