Commercial Grade Concrete Sealer, Hardener, Densifier & Salt Barrier


LITHISEAL ZLi 71 is a clear, solvent-free, odorless, VOC compliant, water-based environmentally safe-to-use salt barrier and dust proofer that seals, hardens and densifies concrete and masonry.

LITHISEAL ZLi 71 was developed to treat a wide variety of mineral substrates including architectural concrete, concrete block, splitface block, pavers, stucco, porous and dense brick, clay tile and exposed aggregate concrete. It has been found to be particularly effective in commercial applications where high water repellency performance is required.


LITHISEAL ZLi 71 incorporates the sealing, hardening and alkali-silica reaction (ASR) preventing properties of lithium silicate with the chloride protection of silane/siloxane, all in a single, permanent application. LITHISEAL ZLi 71 forms an effective chloride ion screen providing unmatched protection against water and water-carried salts that cause erosion, deterioration and corrosion. LITHISEAL ZLi 71 can be used as an interior or exterior treatment for both horizontal and vertical concrete and masonry. It is perfect for parking garages, bridge decks, brick structures, historic restoration and integrally colored concrete.

LITHISEAL ZLi 71 proprietary silane/ siloxane technology provides excellent water repellency to reduce cracking, spalling, freeze/thaw damage, chemical degradation, biological growth, efflorescence, and dirt pickup, thereby lengthening substrate life and reducing maintenance costs.

LITHISEAL ZLi 71 helps prevent Alkali-Silica Reaction (ASR), a serious problem that occurs when the alkali in the large and fine aggregates reacts with the silica in the cement and with water to form an expansive gel, which can break concrete apart. Other chemical hardeners use potassium or sodium compounds, which can raise alkalinity and contribute to ASR. LITHISEAL ZLi 71 uses lithium technology that does not contribute to the alkalinity and can even prevent surface ASR.

LITHISEAL ZLi 71 meets industry standards (NCHRP 244) for protecting concrete against chloride intrusion. (89% + effectiveness)

LITHISEAL ZLi 71 is vapor permeable to resist cracking, peeling and blistering. This lengthens substrate life and allows for greater structure strength over time.

LITHISEAL ZLi 71 protects gray and colored concrete from weathering and efflorescence thereby reducing maintenance, cleaning costs and repairs.


Lithseal ZLi71 comes in 5 Gal plastic Pail 45.75 lbs, 55 Gal Drum 496 lbs


Broom Finished Concrete – 200-300 sq ft per gallon
Steel Troweled Concrete – 350-500 sq ft per gallon

*Coverage rates will vary with concrete mix, porosity, finish, and environment

Typical Coverage Estimates; between 200-300 sq ft per gallon

  • Porous concrete
  • Smooth concrete, precast
  • Exposed aggregate
  • Stucco
  • Exterior brick
  • Rough stone, sandstone
  • Bridge decks and other surfaces subject to abrasion
  • Any material with a Portland cement binder – DRYING TIME 1-2 hours


  • 1-2 Hours for foot traffic
  • 24-48 Hours for vehicle traffic


  • Form: Milky white, dries clear
  • Solvents: None
  • Total Solids: 28%
  • Active Ingredients:
  • 100% of total solids
  • Weight/Gal: 9.28 lbs/gal
  • Specific Gravity: 1.14
  • Volatile Organic Content: .2 lb/gal
  • pH: 9
  • Slip Resistance: Does not change surface friction coefficient
  • Shelf Life: 1 year in factory sealed container

*Must employ all recognized slip and fall prevention techniques


  • Do not apply to glazed or acrylic coated surfaces
  • Do not use on asphalt surfaces
  • LITHISEAL ZLi 71 is designed to react with alkaline siliceous substrates. The active ingredients in the sealer treatment will not chemically react with acidic substrates.
  • LITHISEAL ZLi 71 is not intended to serve as a waterproofing material
  • Do not use below grade


Surfaces to receive LITHISEAL ZLi 71 should be clean and free of all foreign materials such as bond breakers, curing agents, form release oils, grease, dust, construction laitance, other coatings etc.

Cleaning methods which are compatible with the application of LITHISEAL ZLi 71 include:

  • Mechanical-abrasive blasting (sand, baking soda, bead blast, vacuum)
  • Chemical-acid etching, stripping, solvent degreasing, caustic soda scrubbing, alkaline soap scrubbing, high pressure washing, high pressure washing with sand. If a d-limonene (citrus) based cleaner, acid or solvent degreaser is used, the surface must be neutralized using a high pH detergent
  • (i.e. TSP, Dawn Dish Detergent, Tide etc.) before applying LITHISEAL ZLi 71. Remove all standing water.
  • Heat- propane and acetylene torching

Before using any surface preparation method a test patch should be performed with the customer’s approval to be sure that their needs are met.

New concrete should be allowed to cure for at least 28 days before applying LITHISEAL ZLi 71. In addition, any repair work should be performed at least 3 days before application.


A test patch should always be performed prior to general application with the customer’s approval to ensure that desired water repellency and appearance is achieved. Let surface dry before inspection and approval of desired application.

Horizontal Application:
Use a low pressure or HVLP sprayer or roller to apply LITHISEAL ZLi 71 so as to saturate the surface. Flooding is the preferred way, applying two “wet on wet” coats to ensure complete coverage. Retreat within three to five minutes after initial application. Proper quantity on horizontal surfaces
is indicated when the solution stands for a few seconds before completely penetrating. Distribute any pools of material with a broom.

Vertical Application: Apply from the bottom up using a low pressure, 10-25 psi sprayer with a fan-type nozzle. Flood surface until excess solution runs down 6” to 8” below spray pattern nozzle or roll or sponge surfaces sufficiently to create a uniform wet-look. Because the porosity of substrates and application conditions can vary greatly, SEALWIZE is not responsible for any shortfalls or excess consumption based on the estimated coverage rates noted above. For precise rates of consumption, a pre-application
field test should be performed.

Proper application is the responsibility of the user. Field visits by SEALWIZE personnel are for the purpose of making technical recommendations only and are not for supervising or providing quality control on the jobsite.


Typical drying time is 1-2 hours for both horizontal and vertical surfaces.

Horizontal surfaces are ready for foot traffic and use when dry. Vehicle traffic should be kept to a minimum for at least 24 hours. A light lithium residue may form on the surface after the surface is dry. This is excess solution that was not absorbed and can be removed with a stiff broom. Caution: During application, surfaces wet with solution may be slippery.

LITHISEAL ZLi 71 may etch glass and painted surfaces. Immediately wash off overspray with soap and water.

Water repellency and hardness continues to develop for up to 20 days following the application; however, significant results should be visible within 24 hours.

All clear sealers will accentuate any nonuniformity in concrete color, texture, or finish.


Thoroughly rinse all application equipment with clean water.


LITHISEAL ZLi 71 is environmentally friendly and requires no special or hazardous disposal methods. Always be familiar with local, state and federal disposal regulations.


LITHISEAL ZLi 71 is a water-based Lithium
Silicate/Silane/Siloxane solution that uses proprietary compounds. The material is mildly alkaline and may cause eye and skin irritation.


Do not take internally. Avoid prolonged contact with skin. If swallowed, do not induce vomiting- call a physician. Avoid contact with eyes. Protective eyewear and clothing is recommended. If splashed in eyes, wash immediately with clean water and call a physician. Additional precautions, safety information and first aid treatments are contained in the Material Safety Data Sheet.










Construction Technology Laboratories
NCHRP 244 Report
Series II Reduction in Water Absorption 20.0 1 day: 75% 5 days: 78%
21 days: 85% Avg. 79%
Reduction in Chloride Ion Content 1 day: 70% 5 days: 81%
21 days: 89% Avg. 80%
Water Vapor Transmission 100%
Series IV
Southern Exposure
Accelerated Weathering Test: Resistance to UV light
Reduction in Soluble Chloride
20.0  No Discoloration
91% Reduction in Soluble Chloride
ASTM E 514-86 Water Penetration and Leakage
Through Masonry
10.020.0 90% Reduction in Leakage Rate
89% Reduction in Leakage Rate
T-259 &T-260
Resistance of Concrete to Chloride Ion Penetration 20.0 75% Reduction in Total Chloride
 EPA 24/ASTM D3960/ Volatile Organic Content 100.0 .2 lbs./gallon
Fed Spec TT-C-55B Wind Driven Rain 200 Hours with no Effect
ASTM E 96-95 Water Vapor Transmission (perms) Up: 3.1 (Untreated: 2.9)
Down: 2.5 (Untreated: 3.0)
Federal Specification
Water Repellency
(1.0% Maximum Specified)
0.2% Water Absorption
0.2% Water Absorption
0.3% Water Absorption