Sherwin-Williams Loxon Masonry: Honest Review (2026)

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Verdict: ★ 4.3 / 5

Loxon is the coating I reach for when a stucco or block wall has thrown off paint before. It goes straight onto raw masonry at a pH that would eat a wall paint alive, it builds enough film to bridge the small stuff, and it sheds wind-driven rain after two coats. It costs more than the box-store masonry paints, the flat sheen is the only real look, and it is not the basement waterproofer the name hints at. For exterior masonry that needs to last, it earns the price.

Buy this if: you’re coating stucco, CMU, or fresh concrete and the wall has a history of efflorescence, chalking, or alkali burn.

Skip this if: you want a satin or eggshell finish, you’re painting an already-sound, previously-painted wall on a budget, or you think it’ll waterproof a leaking foundation. It won’t.

What Is Sherwin-Williams Loxon?

Sherwin-Williams sells more lines than any homeowner can track, and Loxon is the one built for the surface that fights back: bare masonry. Concrete, block, and stucco come out of the bag high in alkali, and that alkalinity will saponify a normal acrylic and lift it off in sheets within a season. Loxon is formulated to sit on that high-pH surface and stay put. SW has run the Loxon name for over two decades and reworked the XP formula a few times, most recently pushing the VOC down and adding a zero-VOC base option.

Loxon isn’t one product. It’s a family, and the family is where buyers get tripped up. The XP Masonry Coating is the high-build pigmented topcoat most people mean when they say “Loxon.” There’s also a clear primer/sealer, an acrylic topcoat, and a dedicated waterproofing version with elastomeric crack-bridging. This review covers the XP Masonry Coating, because that’s the one that does the heavy lifting on a repaint.

Which Loxon Are You Buying?

The Loxon shelf has four products under one name. Grab the wrong one and you’ll prime when you meant to topcoat, or topcoat when the wall needed a sealer first.

If your wall is sound, smooth, and already painted, the Acrylic Coating is the cheaper rung. If it’s cracking, step up to the Waterproofing version. The XP Masonry Coating is the middle of the line and the right pick for raw or efflorescing stucco and block.

Spec Sheet

Coverage is the number that surprises people. On smooth poured concrete you’ll get close to 95 square feet. On a heavy-textured stucco you’re down near 75, sometimes less, and you need two coats. Run the math on the rough end of that range or you’ll come up a bucket short on the wall.

Per-Attribute Sub-Scores

What It’s Good At

• Alkali tolerance on raw masonry. This is the whole point. I’ve put Loxon XP straight onto green stucco that would have lifted a standard exterior acrylic by the next rainy season. The pH-13 rating isn’t marketing; it’s the spec that lets you coat fresh block without a separate alkali-resistant primer.
• Efflorescence resistance. On a foundation wall that kept pushing white salt crystals through the old paint, Loxon held. You still scrape and wire-brush the existing efflorescence off first. But the coating doesn’t feed the cycle the way a cheaper masonry paint does.
• Film build and rain shedding. It goes on heavy. Two coats build enough mil thickness to shrug off wind-driven rain, which is the failure mode on exposed stucco walls facing a storm direction. Thin box-store masonry paint just doesn’t carry the same film.
• Self-priming on most masonry. You skip a coat. Direct-to-masonry means one product, two passes, done, as long as the wall is cured and clean. That saves a day on a big elevation.
• Mildew resistance in shade. North walls and tree-shaded elevations that grew mildew under the old finish stay cleaner longer. Not bleach-proof, but a real improvement.

What It Falls Short On

• Flat is your only sheen. The XP Masonry Coating comes in flat, period. On a textured stucco wall that’s fine, it’s the right look. But if you want any sheen or wipeability you’re moving to the Waterproofing SKU’s satin or a different product. Buyers expecting an eggshell masonry finish get surprised at the counter.
• It is not a foundation waterproofer. The name says waterproofing and people read that as basement-sealing. It isn’t. Loxon breathes by design so trapped moisture can escape, which means it won’t hold back hydrostatic pressure or standing water. For a wet interior basement wall you need a cementitious waterproofer like Drylok-style product, not Loxon.
• Heavy to work by hand. This is a high-build coating. Brush it onto rough stucco and your forearm will let you know. Spray and back-roll is the right method, and not every homeowner owns or rents a rig. Plan the labor.
• Price and the cure clock. At $55-75 a gallon it’s well above Behr or Valspar masonry paint, and on rough stucco the thirsty coverage stretches that further. Add the 7-day wait on fresh concrete before you even start, and a quick weekend job it is not.

A Word on the “Waterproofing” Name

This is where I see the most regret. A homeowner reads “Loxon XP Waterproofing,” buys it for a damp basement wall, rolls two coats, and a month later the wall is bubbling.

Loxon is a vapor-permeable exterior coating. It’s built to keep wind-driven rain out of an above-grade masonry wall while letting moisture vapor escape from inside the wall. That’s the correct design for stucco and block above grade. It is the wrong tool for below-grade water under pressure. Push water against the back of a breathable coating and it lifts.

If your problem is rain hitting an exposed exterior wall, Loxon is your coating. If your problem is water seeping through a foundation from the soil side, it isn’t. Read the elastomeric and masonry coating explainer before you buy on the name alone.

Loxon XP vs the Box-Store Masonry Paints

Behr Premium Masonry, Stucco & Brick and Valspar’s masonry line both sit around $35-45 a gallon. They’re real products and they work on the right wall: a sound, low-alkali, previously-painted masonry surface that just needs a refresh. On that wall, paying double for Loxon is overkill.

Where Loxon pulls ahead:

• Raw or fresh masonry. High alkali, no existing paint film. The box-store paints want a separate alkali primer first; Loxon doesn’t.
• Efflorescing or chalking walls. Loxon’s film build and adhesion outlast the cheaper coatings here.
• Exposed, storm-facing elevations. More mil thickness means better wind-driven-rain resistance.

Where the box-store paint is the smarter dollar: a covered, low-exposure, already-painted wall that’s just looking tired. Don’t pay for alkali tolerance you don’t need. If you’re cross-shopping, the best masonry and block paint round-up lays the field out side by side.

Who It’s for / Not For

Buy this if: you’re coating bare or fresh stucco, CMU, or poured concrete, especially a wall that has chalked, effloresced, or lifted paint before. The alkali tolerance and film build are what you’re paying for, and on that wall they’re worth it.

Skip this if: you want a satin or wipeable finish, you’re refreshing a sound and already-painted wall on a budget, or you’re trying to stop water coming through a foundation. For that last one, you want a true cementitious waterproofer, not a breathable masonry coating.

Honest Alternatives

Cheaper: Behr Premium Masonry, Stucco & Brick ($35-45/gal)

Half the price, sold at every Home Depot, and fine on a sound, previously-painted, low-alkali masonry wall. Less film build and it wants a separate alkali-resistant primer on raw or fresh surfaces. The right call when the wall is already coated and just needs a freshen-up. → Amazon

Pricier Upgrade: Loxon XP Waterproofing ($65-85/gal)

Same family, more money, real elastomeric crack-bridging and a satin option the flat XP doesn’t offer. Step up when the wall has hairline cracks that move with temperature and you want the coating to flex over them instead of cracking through. → SW direct

Specialty: Dunn-Edwards EFF-STOP Premium ($50-60/gal)

A West-Coast favorite built for the same alkali-and-efflorescence problem, common on Southwest stucco. Worth a look if you have a Dunn-Edwards store closer than a Sherwin-Williams. Compare the alkali rating and the warranty before you switch; the two are close competitors on stucco. → Read more brands

Where to Buy

Buy it from a Sherwin-Williams store. Loxon is a pro-channel product first, so the store will tint it right, sell you the matching primer, and a contractor account knocks real money off the shelf price. The 5-gallon bucket is the move on any full elevation; the per-gallon savings add up fast on a thirsty stucco wall.

Related

• All Sherwin-Williams paint lines reviewed →
• Best masonry and block paint round-up →
• What elastomeric masonry coatings actually do →