Gem-Tek® 5105 Concrete Sealer

This product has been discontinued. An industrial-grade, 100-percent actives, modified silicone/siloxane sealer that enhances, protects, and provides a clear, gloss finish.

  • Coverage Up to 400 square feet
  • Coats 1
  • VOC Content 50 g/L
  • Finish Low-Sheen
5105 Concrete Sealer Bottle Image

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Gem-Tek 5105 is the industry's highest performing decorative sealer designed especially for tumbled marble, limestone, slate, stone and saltillo clay tile. This unique formula leaves the surface with a high-gloss, wet-look shine with a clear, non-yellowing finish. This product has an extremely fast set time and an unsurpassed stain resistance. The treated surfaces will resist chipping, flaking, delamination and breakdown with UV light exposure.


Exceptional when used for:
  • Substrates: Tumbled marble, limestone, slate, stone and saltillo clay tile
Not for use on:
  • Substrates: Concrete



  • Easy to clean surface
  • Color enhancement
  • Durable high-gloss "wet-look" finish
  • Intercoat adhesion
  • Recoatable with another solvent-based product
  • Easy to apply


  • Dirt pick up
  • Mold/mildew growth
  • Surface staining


  • Water ingress
  • Weathering
  • Carbonization, weak acids and alkaline solutions
  • Wind erosion and general exposure
  • UV radiation

Gem-Tek 5105 Rises Above

Gem-Tek 5105 meets or exceeds the following tests:

  • ASTM D-3359: Adhesion
  • ASTM D-3363: Film Hardness
  • ASTM D-4541: Pull-Off Strength
  • ASTM G-155: Accelerated Weathering
  • ASTM D-523: Specular Gloss

Durability Percentage Improvement vs. Control

Sealer A
Gem-Tek 5105
Sealer Product

Auxiliary Information

  • Technical Specs

    • Feature: Stone enhancing sealer
    • Chemistry: Modified silicone siloxane
    • Color: Clear
    • Finish: High gloss, wet look
    • Category: Penetrating
    • Carrier: No carrier
    • Availability: Ready to use
    • Packaging: 1 Gallon
    • Coverage: Up to 400 sq. ft. per gallon
    • Interior/Exterior: Interior/Exterior
    • Application Method: Roller, brush, cloth
    • Application Temperature: 45 F - 90 F
    • Number of Coats: 1
    • Drying Time (dry to touch): 6 Hours
    • Drying time (full cure): 24 Hours
    • Time before/after rain: 48 Hours
    • New Concrete: Yes, at least 28 days after being poured
    • Storage/Shelf Life: 1 Year
    • Clean up: Solvent
    • Paintable: No
    • VOC Content: 50 g/L
  • Preparation

    Avoid contact with skin, eyes and clothing. Wash hands after use and do not take internally. Please refer to the product Safety Data Sheet (SDS) before using. The preparation process should be followed to ensure adequate penetration and optimum performance:

    Step 1: The concrete substrate must be structurally sound, thoroughly dry and clean. Wait at least 24-48 hours after rain and/or pressure washing before sealing; concrete should be visibly dry.

    Step 2: Remove all paints, previous sealers and/or adhesives before application.

    Step 3: The substrate must be clean of oil, grease, dirt, wax, curing compounds, efflorescence and other contaminants that might interfere with the penetration of the sealer.

    Step 4: If acid is used to clean the concrete, neutralize the surface completely and rinse it with water prior to application. Then wait for the concrete to dry out for at least 24-48 hours.

    Step 5: The surface-zone moisture content of the concrete should not exceed 4%wt.

    Step 6: Cover all surrounding areas not intended to be coated.

    Step 7: New concrete must be cured for at least 28 days before sealing.

  • Application

    Step 1: Gem-Tek™ 5105 is ready to use right out of the container. Stir extremely well before use.

    Step 2: Pour the Gem-Tek™ 5105 into a paint tray or bucket. Dip a good quality 3/8" nap roller, brush or lint free cloth into the tray or bucket.

    Step 3: Roll or brush one coat onto the application area in a thin and uniform manner. Too thick of an application will result in entrapment and subsequent product failure.

    Step 4: Roll out any puddles until the sealer penetrates the substrate. Excess material should be removed to prevent inconsistencies in the enhancement.

    Step 5: One extremely thin coat should be applied to achieve an enhanced appearance. If an additional coat is desired, apply an extremely thin coat immediately after the first coat to achieve an enhanced appearance with a higher sheen.

    Step 6: When the entire application has been treated, let the concrete dry for at least six (6) hours before walking, 24 hours before driving, and protect the concrete from rain for at least 24-48 hours after sealing.

    Step 7: Clean up: Application tools can be cleaned using a solvent.

    Step 8: Unused or old material may be disposed of in a waste disposal site in accordance with local, state and federal laws.

    Application Notes

    • Before application test the sealer by applying in an inconspicuous area to ensure the desired coverage and appearance is achieved.
    • Do not apply to damp or wet concrete.
    • Do not apply too thick of an application.
    • Do not use in immersion service or constant chemical exposure areas.
    • Surface may become slick when wet.
  • FAQ

    Does the concrete need to be dry before sealing? Yes, the concrete needs to be as dry as possible before sealing. We recommend the moisture content of the concrete be less than 4% wt. It is recommended to wait at least 24-48 hours after rain and pressure washing before sealing.

    What can I use to apply this product? The Gem-Tek 5105 can be applied with a roller, brush or lint free cloth

    What is the difference between the Gem-Tek 5105 and the Gem-Tek 5100? The Gem-Tek 5105 is a silicone/siloxane that will leave a high gloss, wet look finish. The Gem-Tek 5100 is a water based silicone/siloxane that will leave a matte finish.

    Where can I buy this product? The Gem-Tek 5105 is available through a number of distributors found on our distributor page.