Densifiers function by interacting with the calcium hydroxide and free lime in the concrete after reaching its surface. A byproduct of this process fills the pores in the concrete, increasing the density of the surface. Lithium, sodium, magnesium, potassium, and other alkali or alkaline earth metal silicates are commonly used to make densifiers. Since lithium silicate works well and doesn't harm the environment, it is the most widely used.

Applying a chemical solution to concrete to improve its surface density, hardness, and sheen is known as a densifier. Concrete that is polished or unpolished is treated with densifiers:

• Unpolished concrete : Densifiers are used to reduce dusting and improve stain resistance.
• Polished concrete : Densifiers are used to help polished concrete shine better. Polishing can remove micro-chunks from the concrete's surface, which can decrease the shine and uniformity.
• Stucco : Concrete densifiers can increase the strength and density of stucco.