Today I rented a Edco dual disc concrete floor grinder and a edco turbo7" edger style floor grinder. I also got the vacuum to go with it. I started out with doing the perimeter with the edger. It had a cup style diamond disc on it. Seemed to work well. I then went on to use the dual disc grinder with the dymaserts. To my surprise this unit was barely doing anything to the floor. It was like taking steel wool to the concrete. Didnt change the finish 1 bit. I switched them out for some really course stones. Same exact thing. The floor was poured 90 days ago. It has a really smooth finish and it is a home garage. There are ares on the garage floor that have spilt latex interior wall paint. The dual disc grinder will not remove it.
