(3 customer reviews)


1 Gallon Ultra Concentrate MAKES 5 GALLONS: $69.88

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Sila-Tek 3500 is an industrial-grade, water-based, sodium densifier for use as a stand-alone product or as a primer to strengthen and harden concrete making it up to 50% stronger. It is the go-to choice to harden and prime basements and driveways and it is also an excellent choice for polishing concrete.


1 Gallon Ultra Concentrate: Up to 500 sq. ft (including both coats, two coats are recommended)

1 Gallon Concentrate mixes with 4 gallons of water to make 5 gallons


  • Increases abrasion resistance
  • Strengthens concrete up to 50%
  • Excellent penetration
  • Reduces the substrate porosity
  • No appearance change to the concrete, dries clear
  • Easy to apply
  • No odor
  • Will never yellow, fade, peel, crack or bubble


Warehouses and industrial facilities, Use as a primer prior to application of Siloxa-Tek 8500.



Not for use on: bricks, concrete blocks/cinderblocks, polished concrete/extremely smooth concrete surfaces


  • Feature: Densifier & hardener
  • Chemistry: Sodium silicate
  • Color: Clear
  • Finish: Invisible
  • Category: Penetrating
  • Carrier: Water
  • Packaging: 1 Gallon Concentrate
  • Reconstitution Ratio: 1 part sealer : 4 parts water (distilled water is recommended)
  • Interior/Exterior: Interior/Exterior
  • Application Method: Sprayer, Roller
  • Application Temperature: 40 F – 95 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: Soap/water
  • Paintable: Yes
  • VOC Content: 0 g/L

For complete Sila-Tek 3500, SDS Sheets, FAQ’s, testing and technical data visit

Have an application question, help figuring out the right product for your application or need help calculating your square footage? Give us a call 888-230-5569 or email us:

Additional information

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3 reviews for SILA-TEK 3500

  1. stu

    Used this sealer and then used the Siloxatek product to prevent spalling on my driveway in the wintertime. Easy application process, but took a lot longer than I expected since there is a few days wait time between using each product. Applied them both a few months ago and the combination seems to be working well.

  2. Eskino

    Use solely as a hardener was told this product would not waterproof

  3. Jake F

    Bought this at the buy one get on free price – the best price out there for a silicate densifier!

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