My main shop is a single car garage with a 7 year old concrete floor. It was a hot day and I was working alone when I poured the slab, the concrete got ahead of me so she dried a bit rough. Today I rented a low speed rotary grinder and ground the concrete. The grinder uses 6 abrasive stones like a very course grinding wheel so the floor is smooth but NOT polished. It came out pretty good with a few low spots porous areas and trowel marks still visible. Now I want to seal it. I am thinking a two part epoxy kit but want to hear what others have done and how it worked for them?