Use the power trowel in the float position at three-quarter speed to fill any valleys and level any hills in the surface and at full speed with the blades at maximum pitch to seal, close and polish the surface. Begin using a power trowel to float the concrete when a footprint test leaves an impression of 1/8 inch or less.
Have the concrete poured and rough-leveled several hours before beginning the use of the power trowel. Select a walk-behind trowel with 24- to 36-inch blade when finishing areas less than 1,000 square feet, or use a larger riding power trowel for larger areas. Choose between specific float and finish blades or a combination blade that does both jobs.
During the float finish, keeping the blades flat provides more support for the machine and prevents it from digging into the surface. A slower speed helps to reduce splatters. Overlap each pass of the trowel half the distance of the previous path. At the completion of the first float pass, begin the process again, operating the machine in a perpendicular direction.
Adjust the blades to the finish setting, and increase the speed. Continue using the machine at right angles until the surface reaches the texture you desire.
Power floats provide a level and smooth finish for concrete surfaces. Wear hearing protection and safety goggles when using the machine.