Quick Answer: The professional polishing sequence uses metal-bond diamonds for the coarse grinding and flattening steps, then resin-bond pads for the refining and gloss steps. Start with metal bond at 30 to 50 grit to open the surface, move through 100 and 200 metal, then switch to resin at 200, 400, 800, and 1500 for the sheen you want.

Why Two Bond Types

Metal-bond diamonds cut fast and stay aggressive, which makes them perfect for removing grinding marks and flattening the slab. Resin-bond pads are flexible and cut finer, which lets them produce the reflective surface metal bond cannot. The combo gives you both speed and gloss: metal for the work, resin for the shine.

The Standard Sequence

1. Metal bond 30-50 grit: open the surface, remove coatings and grinding marks.
2. Metal bond 100-200 grit: flatten the slab and remove coarse scratches.
3. Densifier: apply after the coarse metal steps on a clean, dry floor.
4. Resin bond 200-400 grit: refine the surface and start the gloss.
5. Resin bond 800-1500+ grit: build the final sheen; stop earlier for a matte finish.

This sequence works on both planetary grinders and hand-held polishers with the right pads. Your resin polishing pads should match the machine size and the grit you are running.

When to Switch Bonds

Switch from metal to resin when the surface has no visible coarse scratches. If you switch too early, resin pads cannot remove metal marks and the finish stays dull. If you switch too late, you waste time in unnecessary metal passes. Check with a clean, wet rag: the surface should feel smooth and look uniform.

Common Mistakes

• Skipping a grit step: leftover scratches show in the final gloss.
• Switching to resin before the metal marks are gone.
• Polishing dry without dust control on the metal steps.
• Applying densifier at the wrong stage or on a damp floor.

FAQ

Can I use only resin pads to polish concrete?

For a light refresh, yes. For full polishing, metal bond removes grinding marks first; resin alone cannot flatten a rough slab.

What grit should I switch from metal to resin?

Usually after the 100-200 metal step. The surface should be smooth with no coarse scratches before resin begins.

How many steps does a full polish take?

Typically six to eight: three to four metal steps, densifier, then three to four resin steps up to the target grit.

Conclusion

Metal bond flattens, resin bond shines: that is the whole combo. Run the sequence in order, switch at the right time, and check the surface between steps. With resin pads matched to a clean metal grind, concrete finishes dense, even, and glossy.