Quick Answer

Apply the densifier after coarse grinding (200 grit) and before fine polishing (400+ grit). Densifying too early wastes product in an unground surface; too late means the finer grits polish a soft, dusty layer that will not hold a gloss.

Key Features of Correct Timing

• Why 200 grit: the surface is open and clean enough for the densifier to penetrate the capillaries.
• Why before 400 grit: the densifier must cure before fine polishing builds the gloss on a hardened surface.
• Coverage: apply evenly with a squeegee or sprayer, then spread with a floor pad until absorbed.
• Cure time: follow the manufacturer's dry and cure time before continuing the grit sequence.

How to Choose the Right Sequence

Stage	Grit	Action
Grind	50–200	Level and open the surface
Clean	—	Vacuum dust completely
Densify	After 200	Apply and cure densifier
Polish	400–800	Build the base sheen
Gloss	1500–3000	High-gloss finish
Protect	—	Burnish or seal

How to Apply It Correctly

1. Vacuum the floor after 200-grit grinding — dust blocks penetration.
2. Apply densifier at the manufacturer's coverage rate, keeping the surface damp for several minutes.
3. Let it dry and cure fully; on hot or dry sites, mist lightly to extend open time.
4. Proceed with 400-grit polishing once cured.

Frequently Asked Questions

Q: Can I apply densifier before grinding?

A: It is wasteful — grinding removes the densified layer. Apply after the surface is flat and open.

Q: Can I apply densifier at 400 or 800 grit instead?

A: Yes, some crews densify at 400 grit, but 200 grit is the most common and gives the deepest penetration.

Q: How long should the densifier cure before polishing?

A: Usually 1–4 hours depending on the product and conditions. Always follow the label and test in a small area.

Conclusion

Densify after 200-grit grinding, then polish through the fine grits for a gloss that lasts. Pair the sequence with quality resin pads like the Diamond Resin Polishing Pads for Concrete & Terrazzo Floor (JOY-RFP-01) or the Diamond Resin Floor Polishing Pads (JOY-RFP-02), and finish with Burnishing Pads for Concrete Floor Polishing (JOY-RFP-BP2).