Rated 4.33 out of 5 based on 3 customer ratings
(3 customer reviews)

16 oz Sample: $12.88 (samples are not returnable)

1 Gallon Ultra Concentrate MAKES 5 GALLONS: $44.88

The industries most innovative concrete sealer formulas just got better! 1 Gallon Ultra Concentrate makes 5 gallons of sealer, equating to 75% less packaging, 50% less transportation cost and 75% less empty container waste making the Ghostshield formulas extremely sustainable.




An industrial-grade, water-based, sodium densifier for use as a stand-alone product or as a primer to strengthen and harden concrete.


1 Gallon Concentrate Coverage: Up to 500 sq. ft (including both coats)

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

Applications: Warehouses and industrial facilities, use as a primer prior to application of Siloxa-Tek 8500 or Siloxa-Tek 8505

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
  • Availability: Ultra Concentrate: Makes 5 Gallons
  • Packaging: 1 Gallon
  • Reconstitution Ratio: 1 part sealer : 4 parts water
  • Interior/Exterior: Interior/Exterior
  • Application Method: Sprayer, Roller
  • Application Temperature: 45 F – 90 F
  • Number of Coats: 2
  • 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

Additional information

Weight N/A

3 reviews for SILA-TEK 3500

  1. Rated 4 out of 5


    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. Rated 4 out of 5


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

  3. Rated 5 out of 5

    Jake F

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

Add a review

Your email address will not be published. Required fields are marked *