How To Repair Old Concrete
Fixing old concrete may mean just re-doing a previous coating or floor system that needs maintenance, or starting over from scratch and reapplying a coating. It may include structural repairs of cracks, spalls and other defects in the concrete itself.
If a coating is peeling or scraping off, it is always better to get rid of it so you have a good substrate for the next step of putting a new product on the floor. You can use chemical and water means: Applying a cleaner or stripper and washing with water, such as out of a pressure washer. This method is pretty messy and risks emulsifying old coating and soaking it further down into concrete, which is not always a good idea. You can use mechanical means: Grinding with abrasive pads, grinding machines, or shot blasting.