This form of polished concrete is high in demand and is a finish which is also the hardest to achieve.  Generally, we are only able to offer this service for newly poured concrete slabs that have been poured with a high MPa number, a leveled floor and properly power trowelled floor with the helicopter-like tool. If the concrete is soft and is not level then Nil Exposure polished concrete may not be an achievable finish, the alternative would be minimal exposure polished concrete. If your concrete has not been poured yet and you desire the Nil Exposure polished concrete floor then look to get an experienced concreting company and you must let the concreting contractors know that you want the slab poured for polished concrete purposes. The main idea of a Nil Exposure is that we grind off the least amount of concrete possible so that there is little or no aggregate/stones showing in the concrete surface. If we need to, we undergo a grouting process to fill in pinholes and fine cracks in the best possible condition. Once grouting is complete, we then refine the floor with polishing pads until we reach the level of sheen you desire.