Are burnish marks a problem on concrete?
Burnish marks are dark marks on the concrete surface. It appears when the steel trowel blades are overheating with the friction between steel and concrete. When the blades passes many times on the same spot, it becomes hot and the cement contained in the concrete burns and blackens.
These marks might be desired on some finish for a rough and rustic outcome or to reach an higher compaction level. It also might be insignificant for other finish like industrial ones or when the floor is covered. But in some cases, the burnish marks are to avoid because the outcome of the floor is important.
Actually, when the desired result is a good looking, pale or colored concrete, an epoxy finish or any other surfaces where it might appear and where the look matters, burnish marks are the worst enemy of a finisher.
As a matter of fact, these spots can ruin the look of an entire decorative or residential floor and makes it look bad.
To control burnish marks, we suggest using the Plastic Trowel Blades on walk-behind or ride-on power trowel for a good-looking floor.