Natural Shield
Natural Shield
Natural Shield
Natural Shield - semcoworks
Natural Shield - semcoworks
Natural Shield - semcoworks
Natural Shield - semcoworks
Natural Shield - semcoworks
Natural Shield
Natural Shield
Natural Shield
Natural Shield

Natural Shield

Sale price$25.30 Regular price$32.90
Save $7.60
139 reviews
139 reviews
  • Won't change how your surface looks. No gloss, no color shift — just added protection, so your concrete, stone, or stucco still looks like itself.
  • Deeper protection, longer lasting. 6x more active ingredients than typical penetrating sealers, penetrating into the pores instead of sitting on top.
  • Works where other sealers can't. Safe to apply on damp surfaces — it can even help dry out a damp substrate before other coatings go on.
  • Stops the damage that adds up over time. Guards against freeze-thaw cracking, efflorescence, and mold or mildew staining.
Size:1 Pint Sample
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Reduces Freeze Thaw Damage
Penetrating Sealer
Low Odor & Low VOC
Made in USA
  • Durability. Penetrates into the pores and stabilizes the substrate from within, prolonging the life span of the surface and reducing long-term maintenance.
  • UV and alkali resistance. UV-resistant and highly alkali-resistant, with effective protection against freeze-thaw damage.
  • Built for commercial and industrial use. Excellent chemical resistance and an industrial-strength finish suited to demanding commercial and industrial environments, not just residential touch-ups.
  • A real waterproofing sealer. Low water permeability makes it suitable for wet rooms and showers, and it can be applied to damp surfaces where many sealers can’t
    be used.
  • Extends the life of what you already have. Protects the investment in existing mortar, tile, stucco, brick, and natural stone rather than requiring a full resurface.
  • Reduces efflorescence and staining. Enhanced water beading, reduced
    efflorescence, and protection against stains caused by mold and mildew.
  • No change in appearance. The treated surface doesn’t become glossy — it stays tackfree with a natural, unsealed look and feel.
  • Easy application and clean-up. Apply with an airless sprayer, pump sprayer, or
    roller; clean up with SEMCO Stone Soap and water.
  • Protects without changing the look of your surface. Natural Shield penetrates into the pores rather than forming a film on top, so treated concrete, stone, or block keeps
    its natural color, texture, and matte finish — nothing looks “sealed.”
  • 6x more active ingredients than most penetrating sealers. A more concentrated formula means deeper penetration and longer-lasting protection compared to typical
    off-the-shelf penetrating sealers.
  • Fights the damage moisture causes over time. Reduces water absorption enough to help prevent freeze-thaw cracking, pitting, spalling, and alkali-silica reaction (ASR) damage in concrete and masonry.
  • Works on damp surfaces, even mitigates moisture. Unlike most sealers, Natural Shield tolerates damp substrates and is even used on its own to help mitigate constant dampness before other coatings are applied.
  • Commercial and industrial grade, DIY-simple application. Delivers solvent-basedlevel performance and chemical resistance, but goes on with a roller or sprayer and cleans up with water.
  • Protects a wide range of surfaces, not just concrete. Suited to existing concrete, stucco, porous natural stone, slump block, tilt-up walls, and X-Bond Microcement - one product across most of a property’s exterior masonry.
  • Existing concrete. Penetrates weathered or previously uncoated concrete to reinforce and stabilize it from within, extending the life of older slabs without changing their appearance.
  • Stucco. Soaks into porous stucco to reduce water absorption and efflorescence while keeping the original textured look fully intact.
  • Porous natural stone. Protects natural stone’s pores against water intrusion and staining without adding shine, preserving the stone’s natural texture and color.
  • Slump block. Seals the highly porous surface of slump block against moisture penetration and efflorescence - common in retaining walls and garden walls.
  • Block wall and tilt-up wall. Bonds into vertical masonry and tilt-up concrete panels to repel water and resist freeze-thaw cracking, pitting, and spalling over time.
  • PreStain finishes. Locks in stained concrete color while adding water and stain resistance, without adding the gloss that would alter the stain’s natural look.
  • Cinder block. Works well on cinder block walls to repel water and reduce efflorescence - though cracks wider than hairline need to be filled first, since Natural Shield does not bridge cracks the way a membrane does.
  • Brick. Penetrates brick and mortar joints to reduce water absorption and protect against freeze-thaw damage and mold or mildew staining.
  • Not recommended for: painted surfaces (the sealer needs open pores to penetrate) or areas with heavy foot or vehicle traffic — for those, SEMCO recommends Titan Shield Gloss instead.
  • Ideal projects: exterior stucco and masonry walls, retaining walls, natural stone patios and facades, garden and block walls, brick veneer, existing concrete slabs, showers and wet rooms, and as a moisture-mitigation pre-treatment ahead of other SEMCO coatings.
  1. Prep the surface. Sweep all debris off the surface. For concrete or brick, remove mineral deposits or efflorescence first with Nu-Lift Cleaner and Stone Soap. The surface must have open pores — Natural Shield cannot penetrate a painted or
    previously coated surface.
  2. Fill any cracks first. Natural Shield does not bridge or span cracks, so cracks need to be filled before application.
  3. Apply the first coat with a 1/4" nap roller, HVLP sprayer, pump sprayer, or airless sprayer (tip size 15 at roughly 400 PSI). Avoid letting the product puddle - puddling causes a white haze.
  4. Apply the second and third coats without letting the sealer dry in between. This is the opposite of a topical sealer: Natural Shield needs to stay wet through all 3 coats to bond and penetrate properly.
  5. Apply a minimum of 3 coats. More porous surfaces such as concrete or block may need additional coats.
  6. On vertical surfaces, apply from bottom to top to avoid runs, and avoid overspray.
  7. Let it dry and cure. Dry to the touch in about 30 minutes at 72°F; full cure takes about 7 days at 72°F (as fast as 4 days at 100°F).

Good to know: Avoid application in direct afternoon sun or above 85°F. Clean tools with warm water (and Stone Soap, if needed) right after use.

PRODUCT INFO

Engineered for professionals. Easy enough to apply yourself.

Natural Shield is a ready-to-use, water-based penetrating sealer built for concrete, masonry, stucco, and natural stone. Unlike a topical sealer that sits on top of the surface, Natural Shield’s low molecular weight lets it soak into the pores of the substrate, where a chemical reaction creates a solid, breathable membrane from within. The result is durability and performance that matches a solvent-based system, with the easy application and water clean-up of a water-based product.

Because it penetrates rather than coats, Natural Shield leaves your surface’s natural look completely intact — no gloss, no color change, no shift in texture. That makes it the go-to choice for protecting existing concrete, stucco, block walls, and natural stone from water intrusion, efflorescence, and freeze-thaw damage, in both commercial and industrial settings, without changing how the surface looks or feels.

  • Type – Water based Silane and siloxane
  • Coats required – Minimum 3 coats, applied wet-on-wet (do not let the sealer dry between coats 1-3)
  • Coverage – 150–350 sq ft per gallon (3 coats)
  • Application tools – 1/4" nap roller, HVLP sprayer, pump sprayer, or airless sprayer
  • Application temperature – 50°F to 90°F
  • Dry time – only ~10-30 minutes needed between coats at 72°F
  • Cure time – 7 days at 72°F (as fast as 4 days at 100°F)
  • Shelf life – 2 years in controlled ambient storage (60–72°F)

Laboratory test results: water - excellent; alkali resistance - excellent;
used motor oil - good;
transmission fluid - good;
10% hydraulic acid - good.
Application notes: Do not allow the sealer to puddle during application - puddling causes a white haze. Do not apply over an existing coating; the surface needs open pores for Natural Shield to penetrate. On vertical surfaces, apply from bottom to top to avoid runs, and avoid overspray.

PRODUCT DATA SHEET

6. Natural Shield vs. Titan Shield Gloss — Which One Do You Need?

Both are SEMCO sealers, but they solve different problems. Use this to help customers pick the right one (or point them to both, since Natural Shield is often used as a prep step before Titan Shield Gloss on damp substrates).

Natural Shield Titan Shield Gloss
How it works Penetrates into pores; chemical reaction from within Forms a topical film on the surface
Finish No visible change — natural, matte look Visible gloss finish, available in 18 colors
Traffic rating Light foot traffic only Commercial and industrial vehicle traffic
Can it go on damp substrates? Yes — can even help mitigate dampness No — requires substrate moisture under 3–5%
Typical use Stucco, natural stone, block walls, brick, existing concrete Garage floors, driveways, pool decks, high-traffic commercial floors
Coats Minimum 3, applied wet-on-wet Minimum 3, each allowed to dry before recoating

SEMCO Liquid Membrane™ is trusted by professional waterproofing contractors, builders, pool service companies, property managers, and facilities teams across the country. We offer dedicated support and volume pricing for businesses.

Benefits List

  • Volume discount pricing on 5-gallon pails and case ordersPriority technical support from application experts
  • Fast reorder history and account management
  • Co-branded project documentation and spec sheets available
  • Suitable for: waterproofing contractors, pool builders, property maintenance, HOAs, facility managers

CTAs

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FOR STEP-BY-STEP GUIDES SPECIFIC TO YOUR PROJECT

Need Assistance?

OUR TEAM OF EXPERTS ARE STANDING BY TO HELP MAKE SURE YOUR PROJECT IS A SUCCESS.
CALL OR EMAIL US AT: 1-833-211-2297 info@semcoworks.com

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