Quick Answer: Burn marks on polished concrete come from resin pads running too hot, usually from high speed, heavy pressure, or a dry pad. Remove them by re-grinding the affected area with the metal bond step that was in use, then re-running the resin sequence locally so the sheen matches the rest of the floor.

What Causes Burn Marks

A burn mark is a heat-discolored or melted spot where the resin pad dwelled and overheated. It happens when you stop on one spot, run the machine too fast with a fine grit, grind dry with resin pads, or push hard on a high-grit step. The discoloration is in the resin and the very top of the concrete paste, so it can be ground out.

Repair Process

1. Mark the burn area and a margin around it.
2. Return to the metal bond grit that preceded the burn, usually 100 or 200.
3. Grind the area flat, feathering the edges into the surrounding floor.
4. Re-run the resin steps (200, 400, 800, and up) only over the repaired area.
5. Blend the final pass over the edge so gloss matches the floor.

Work wet for the resin steps to control heat, and keep the machine moving: no dwell time on fine grits.

Preventing New Burns

• Keep resin pads wet or use a dry system with a burn-prevention pad.
• Run fine grits at moderate speed, not full throttle.
• Never stop the machine on a spot while the pad is down.
• Change pads at the right time; worn resin burns faster.

FAQ

Can burn marks be fixed without regrinding?

Shallow discoloration may lift with a finer resin pass, but most burns need a metal-bond re-grind to restore the surface.

Why do burn marks appear on my polished floor?

Heat from dry, fast, or stationary resin polishing. Friction discolors the pad resin and the paste surface.

How do I make the repair invisible?

Feather the re-grind into the floor, run the full resin sequence on the patch, and finish with a light blending pass across the edge.

Conclusion

Burn marks are heat damage from polishing technique. Re-grind with metal bond, restore the sequence, and keep fine passes moving and cool. With the right resin polishing system, the repair blends in and the floor stays clean.