Water-based densifiers and hardeners that consolidate natural stone, limestone and concrete, raise hardness and abrasion resistance and help mechanical polishing: FS Densi-Shield 200 and 800, Limestone Densifier, Concrete Hardener and Concrete Finish Plus.
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Coverage calculator: how much product do I need?
Coverage from the manufacturer's technical data sheet; very absorbent stone takes more. Test on a small hidden area first. Ask us on WhatsApp
Hardening soft stone and dusty concrete with a densifier
Soft marble, limestone, terrazzo and concrete wear quickly, scratch easily and will not hold a polish. A densifier soaks into the surface and hardens it from within, which raises abrasion resistance and helps mechanical polishing. A densified floor is harder, not stain-proof, so seal it afterwards where food and drinks are used.
How to densify a soft marble floor (Densi-Shield 200 method)
- Grind to 200 grit to remove old sealer and the worn top layer. The stone must be bare.
- Clean off all slurry, dust and oil and let the floor dry.
- Ventilate and keep the surface above 4°C.
- Protect skirting, walls, wood and metal.
- Apply with a mop or sponge and spread evenly with a soft cloth, section by section.
- Keep re-applying until the stone stops absorbing. Softer stone takes more.
- Let it dry 24 hours before polishing further.
- Continue polishing through the finer grits. For a second stage, apply Densi-Shield 800 after 800 or 1200 grit.
- Seal areas exposed to oil, food or drinks once polishing is finished.
Products and coverage
| Product | Best for | Coverage |
|---|---|---|
| FS Densi-Shield 200 | Soft natural stone at the 200-grit stage | 3–5 m² per litre for one full saturation |
| FS Densi-Shield 800 | Second densifying stage after 800-grit grinding | As on the data sheet |
| Limestone Densifier | Limestone; speeds up grinding and polishing | 10–15 m² per litre |
| Concrete Hardener | Concrete floors before mechanical polishing (water-based, VOC-free) | 10–15 m² per litre |
| Concrete Finish Plus | Waterproof, dirt- and stain-resistant satin finish for concrete | 15–20 m² per litre |
Coverage and method figures are from the Faber Italy and Flagstone Fix technical data sheets. Always test on a small hidden area first.
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Frequently asked questions
What does a stone densifier do?
It soaks into soft stone or concrete and hardens it from within, raising abrasion resistance and helping the floor take and hold a polish.
Can I apply a densifier over an old sealer?
No. Old sealer or wax blocks penetration. Grind it off completely first, for example to 200 grit.
Does a densifier replace a sealer?
No. A densified floor is harder but not stain-proof. Apply a stain-proof sealer after polishing in kitchens and dining areas.
How much densifier do I need?
Densi-Shield 200 covers about 3 to 5 m² per litre for one saturation; Concrete Hardener and Limestone Densifier about 10 to 15 m² per litre.
