So Do I Have To Have My Floor Grouted Prior To Polishing Concrete Floors?
Yes, generally speaking, when you have a project to polish concrete, you want it to maintain its beauty and shine for as long as possible. In order to do this, grouting the concrete in between polishing pads is a necessary step.
Grinding concrete opens the slab and creates a scratch pattern. While polishing it with gradually finer pads does smooth away many of the cuts, there are still going to be pinholes and micro pits left behind.
If you apply an epoxy coating, air bubbles will be caught in these voids and prevent the coating from bonding to the concrete properly. If left unsealed, grit and traffic will continually cut and grind into the voids, making them larger. Either way, these nearly invisible flaws will grow over time and ruin the look and structural integrity of your slab.
By applying a coating of grout over the concrete, the air is pushed out of the pits and fills them, allowing you to continue the polishing process or apply a coating.
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