The original polished concrete floor is still the best - (polishing concrete the right way vs adding a coating or guard coat.) This will explain how true polished concrete can be achieved with no addition of a coating or sealer, but purely by mechanical polishing with progressively finer diamonds and into resin bond diamonds.
Polished concrete floors are a high, medium or low-gloss alternative to traditional concrete coating systems. Concrete coatings and sealers are used to achieve a glossy finish to a decorative concrete surface. These coatings must be maintained to retain their shine. Polishing a concrete floor yields an extremely glossy finish without the maintenance associated with sealers and coatings. 
This first step may be repeated until the concrete is sufficiently prepared for a finer grit. Grinding utilizes disks compromised of diamond abrasives woven into a plastic or resin matrix. These disks bring the sheen out of the prepared concrete. This process is repeated, progressing to a final step of an extremely fine grit, often 1500 or finer, to yield an extremely high-gloss finish. The finished product is a smooth, glossy concrete floor that does not require the maintenance of a finish achieved with coatings or sealants. This results in significant savings over the life of the floor.
