Watco Basics Concrete Hardener is a highly effective way to stop concrete from dusting. It penetrates unsealed, weak, dusty concrete and hardens it to the point where it will not dust. If an old concrete surface is wearing away, just one coat of Watco Basics Concrete Hardener will stop it from getting worse. It doesn’t alter the appearance of concrete, just makes it hard. It does not rely on leaving a surface film to protect the concrete, it becomes part of the concrete surface, making it maintenance free. It can be used on any dusty concrete, inside and out, so it will prolong the life of deteriorating paths and driveways.