Sauereisen Inc.

- Model F-120FS - Underlayment Resurfacing Material



Sauereisen RestoKrete® F-120FS Underlayment is an especially fast-setting, Portland-based resurfacing material. It develops its strength very rapidly and is primarily used for trowelable applications. RestoKrete® F-120FS Underlayment is mixed with potable water as a safe, easily applied material. Installation of a chemical-resistant lining or topcoat may proceed after three hours at 70°F in order to minimize downtime.

  • Application time
  • Working time at 70°F: 15 minutes
  • Initial set at 70°F: 1.5 hours
  • Compressive strength: 6,100 psi (425 gm/cm2)
  • Density: 137 pcf
  • Mix ratio (powder to water, by weight): 9:1

  • High early strength material.
  • Quick set allows fast turnaround.
  • Tolerant to cold environments.
  • Adheres to vertical surfaces.
  • Topcoat in 3 hours at 70oF.

Temperature of Working Area

For applications intended to be fast setting, maintain a temperature of 60°-85°F on air, substrate, Liquid, Hardener, and Powder components during mixing, application, and cure.

The monolithic components should be maintained at 65°F to 80°F for 48 hours prior to beginning work.

At temperatures between 35°-65°F, the application window and cure time increases. This allows No. 210FS to be used in cold weather. However, do not apply at temperatures below 35°F. Conversely, in warm weather above 80°F, the material working time is reduced.

Application in direct sunlight and rising surface temperature may result in blistering of the materials due to expansion of entrapped air or moisture in the substrate. Concrete surfaces that have been in direct sunlight must be shaded for 24 hours prior to application and remain shaded until the initial set has taken place. In rising temperatures, it may be necessary to postpone the application or apply during cooler hours.

Anchoring System

When RestoKrete® F-120FS Underlayment is applied on vertical or overhead surfaces at a thickness greater than 1 inch, it should be reinforced or anchored for best results. 'T'-type anchors or 2 inch x 2 inch mesh are suitable to secure the material.

Surface Preparation

Concrete - All surfaces to receive F-120FS Underlayment must be properly designed and capable of withstanding imposed loads. Surfaces must be free of dust, loose particles, laitance, oil, grease, chemical contaminants, and previously applied coatings.

Concrete surfaces which are contaminated with form oils or grease must be chemically cleaned or scarified to remove contaminants prior to beginning recommended surface preparation.

Hydroblasting or abrasive blasting should be utilized to remove laitance, contaminants, or loose particles and to produce a clean hard surface. All standing surface water should be removed prior to applying F-120FS Underlayment.

To ensure maximum adhesion and to prevent dehydration of F-120FS at substrate interface, the concrete should be thoroughly dampened with water prior to application. If concrete cannot be dampened or an unusual stress condition exists, a concrete bonding agent is recommended.

Following hydroblast, all active hydrostatic leaks must be stopped by use of Sauereisen InstaPlug™ F-180 and all structural defects, voids, or cracks in substrate must be repaired prior to application of F-120FS.

Brick - F-120FS Underlayment may be used to patch voids where brick is missing. It may also be applied over brick as part of a resurfacing process, if needed. When using F-120FS in conjunction with brick surfaces, remove oil, grease, and other contaminants that may inhibit bond. If necessary, hydroblast mortar joints to a depth of 1/2' to remove all loose material and to provide a clean, firm surface. All active hydrostatic leaks must be stopped prior to application of F-120FS.

Control joints should only be used when F-120FS is placed over concrete surfaces where existing expansion/control joints are present. Consult Sauereisen for recommendations.


Mixing should be done mechanically with a slow-speed mortar mixer or drill motor with a 'Jiffy' type mixer blade to obtain a uniform consistency. The mixing equipment must be clean and free of contaminants. The size of the batch will be governed by the area to be covered, the number of workers applying the material, temperature of the area and the speed with which it can be placed.

Selection of F-120FS Trowelable or Castable grade will be dependent upon extent of concrete deterioration; whether the application is on vertical, horizontal, or overhead surfaces; and degree of slope required if resurfacing to pre-existing levels.

Sauereisen recommends that powder and water ratios are accurately weighed prior to mixing. If water must be measured in the field by volume, the approximate amount per 25 lb. pail of Powder is 42 fluid ounces (2.8 lbs.) which is the same as three pints or 1.3 liters.

Pour the entire amount of potable water into the mixing container and add the Powder slowly, mixing continuously to avoid entrapped air. Mix slowly and thoroughly for five minutes until uniform consistency. Inadequate mixing or addition of more water will decrease physical properties.

Do not add sand, gravel, portland cement or other additives to F-120FS material. Remove entire batch from the mixing vessel when mixing is completed to prevent build-up in the equipment. While applying one batch, another should be mixed in order to eliminate delays and permit continuous operation.


Troweling - F-120FS Underlayment is typically installed by trowel. Sauereisen recommends a minimum 1/8-inch thickness. When thickness exceeds 1/2-inch on vertical or overhead surfaces, there is a high likelihood that reinforcement is needed.

Casting - Place Sauereisen F-120FS onto properly the prepared substrate to a specified thickness. If forms are required, they should be constructed of firmly braced wood or metal which has been given a light coating of form release agent. The form release agent must prevent F-120FS from adhering to the screeds or forms, but should not leave a residue on the freshly cast material.

Forms are to be completely sealed and rendered watertight with heavy consistency pliable caulking. Seal forms placed over horizontal rough surfaces. The form and screed systems should be strong enough to retain F-120FS in place without deformation. Forms and screeds may be removed after set has occurred and F-120FS has sufficient strength to support itself.

Do not impose loads until final set has been achieved. Lower temperatures will require longer cure periods before removing forms.

Cold joints require a liberal priming of the previously placed material with epoxy bonding agent. The bonding agent should not be allowed to dry prior to placing the freshly mixed F-120FS Underlayment.

Trowel - After placement of material by trowel, apply a broom or brush finish to provide a more desirable bonding surface.

Cast - Place material and screed to desired height. A trowel can be used to distribute material. Broom or brush finish to provide a more desirable bonding surface.

11.4 pounds of RestoKrete® Underlayment F-120FS will cover an area of one square foot at a thickness of one inch. Stated differently, a 25-lb. pail of material will cover 0.203 ft3 or slightly more than two square feet at one inch of thickness.

F-120FS Underlayment is packaged in 25 lb. plastic pails.

Proper curing of F-120FS is critical to the serviceability of the completed structure. Application of a chemical-resistant lining may proceed after 3 hours at 70°F.

If an elapsed time of at least 8 hours is expected before the Underlayment is to be topcoated, moisture retaining measures for proper cure must be taken. After initial set and until application of chemical-resistant lining, F-120FS Underlayment must be properly cured by means of fog spray, wet burlap or an appropriate Sauereisen curing compound

RestoKrete® F-120FS Underlayment has a shelf life of six months when stored unopened in a dry location at 70°F. Avoid freezing.

All equipment should be cleaned by scrubbing with a stiff brush and water at the end of each working period or when build-up becomes pronounced.

Consult Safety Data Sheets and container label Caution Statements for hazards in handling these materials.

Sauereisen, SewerGard®, ConoCrete™, RestoKrete®, ConoGlaze™, and FibreCrete™ are all products or services denoted with ™ or ®. These trademarks or registered trademarks of Sauereisen, Inc. Sauereisen trademarks may not be used in conjunction with any product or service that is not a Sauereisen product or service.

We warrant that our goods will conform to the description contained in the order, and that we have good title to all goods sold. WE GIVE NO WARRANTY, WHETHER OF MERCHANTABILITY, FITNESS FOR PURPOSE OR OTHERWISE, EXPRESS OR IMPLIED, OTHER THAN AS EXPRESSLY SET FORTH HEREIN. We are glad to offer suggestions or to refer you to customers using Sauereisen cements and compounds for a similar application. Users shall determine the suitability of the product for intended application before using, and users assume all risk and liability whatsoever in connection therewith regardless of any suggestions as to application or construction. In no event shall we be liable hereunder or otherwise for incidental or consequential damages. Our liability and your exclusive remedy hereunder or otherwise, in law or in equity, shall be expressly limited to our replacement of nonconforming goods at our factory or, at our sole option, to repayment of the purchase price of nonconforming goods.

  • Distributors and agents in major cities throughout the world. Consult manufacturer for locations.
  • Information concerning government safety regulations available upon request.
  • Sauereisen also produces inorganic compounds for assembling, sealing, electrically insulating and grouting

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