SlabArmor Closer

colloidal silica concrete densifier/hardener

SlabArmor™ Closer is the second step in the SlabArmor system. This colloidal silica densifier/hardener is applied after power troweling has been completed. A single application is applied to the surface and requires no scrubbing or rinsing. Its reactive formula penetrates deep within the capillaries of the substrate to form insoluble calcium-silica-hydrate, hardening and densifying the substrate.

The result is a more water, stain, and abrasion resistant surface, extending the life of the concrete.

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  • Provides additional hardening and seals surface after SlabArmor Starter™ application
  • Increases abrasion resistance
  • Nanoparticle silica fully-penetrates with no film to remove
  • Eliminates concrete dusting
  • Low pH reduces surface alkalinity
  • Contains no soluble salts
  • Water repellency
  • Environmentally friendly, water-based formula/VOC compliant


Active Ingredients100% of total solids
Specific Gravity1.071
Weight/Gallon8.43 lbs
VOC Content<50g/L
Flash PointN/A
Freeze Point32 ºF (0 ºC)
Shelf Life2 years in unopened, sealed container
SizePart No.Full Pallet Qty
5 Gallon PailCCT-113-535
55 Gallon DrumCCT-113-554
275 Gallon ToteCCT-113-2751

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