Quick Answer

A polished finish is built step by step, and every grit stage has a job to do. For glossy concrete, lithium-based densifiers are the more suitable choice for reflectivity: they penetrate deeper, harden faster, and react with the concrete to produce a harder, more polishable surface with less residue. Sodium (silicate) densifiers work and are cheaper, but they can leave a white efflorescence-like film if not rinsed properly and require longer curing before burnishing.

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Lithium vs Sodium Densifier

What matters most in this stage.

Miss this step and the gloss will not come up evenly.

How to Choose the Right One

The practical details.

• New burnished floor (interior): use a lithium densifying sealing layer — apply after 200–400 grit stage, let it dry, after that continue burnishing.
• Old or soft concrete: lithium gives the biggest hardness and mirror finish jump.
• Colored or decorative concrete: assess first; some densifiers slightly darken the surface.
• Budget maintenance projects: sodium silicate is acceptable if you rinse thoroughly and allow full cure.

Crews that rush this part rarely get a mirror finish.

About Application Best Practice

Key points for the polishing sequence.

Apply the densifying sealing layer evenly with a sprayer at 200–400 grit stage, spread with a microfiber or burnisher, and keep the surface wet for 20–30 minutes before letting it dry.

This stage decides how much reflection the floor finally shows.

Frequently Asked Questions

Q: Is it necessary to apply densifier before or after polishing?

A: In short, Apply after the 200–400 grit step, before the finer resin pads. That lets the densifying sealing layer harden the surface that the fine grit stages then burnish.

Q: Can I use sodium densifier on a floor I want high gloss?

A: The practical answer is, Yes, but lithium makes it easier. With sodium, rinse any residue off completely and wait for full cure before fine burnishing.

Q: How exactly much densifier do I need per square meter?

A: For most jobs, Typically 0.1–0.2 L per m² for one coat, depending on porosity. Two light coats beat one heavy coat.

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Conclusion

Follow the grit ladder in order, keep the pads flat, and the gloss builds predictably. Lithium densifiers are the professional choice for glossy concrete — deeper reaction, faster cure, less residue.