The top two densifiers for polished concrete are sodium silicates and lithium silicates. Sodium silicates save on material costs while lithium silicates save on time. Sodium silicates are the best silicate to use if you are doing a basic grind with no color. They keep costs low by requiring less material because they have a larger molecule size and fill larger pores more easily. Lithium silicates have a faster reaction time than sodium silicates so constant brooming is not required. The results are often seen faster with a lithium silicate because of the faster reaction times.
How to Polish Concrete and When to Apply a Concrete Densifier
Concrete densifiers can be applied once, or several times during the concrete polishing process. Grinding concrete is an art, and techniques vary from one company to the next. Most concrete densifiers are applied around the same time the 80- to 150- grit pads are used.
Remove existing coatings and make sure the floor is clean and dry.
Seal cracks and joints with a semi-rigid crack filler.
Grind with a 30- or 40-grit metal-bonded diamond.
Grind with an 80-grit metal-bonded diamond.
Grind with a 150-grit metal-bonded diamond (or finer, if desired).
Apply a chemical hardener to densify the concrete.
Polish with a 100- or 200-grit resin-bond diamond.
Polish with a 400-grit resin-bond diamond.
Polish with an 800-grit resin-bond diamond.
Finish with a 1500- or 3000-grit resin-bond diamond.
Best Sodium Silicate Concrete Densifiers
- Armor S2000 Concrete Sealer Review (concentrated)
- RadonSeal Concrete Sealer Review (pre-diluted)
- Stone Technolgies X-1 Concrete Sealer Review (pre-diluted)
- Ashford Formula Concrete Sealer Review (pre-diluted)
Best Lithium Silicate Concrete Densifiers
- Armor L3000 Concrete Sealer Review (concentrated)
- PS103 Concrete Sealer Review (pre-diluted)
- Lion Hard Concrete Sealer Review (pre-diluted)