The garage floor was in rough shape when we moved in, and because of this I wasn’t particularly careful with it during the 4yrs of bus restoration. I rented a diamond grinder today to begin remedying this. I used the grinder to flatten the high side of the “fault line” cracks and to open up the surface overall in preparation for epoxy coating, and a hand grinder to clear the loose edges out of the cracks. The cracks will be filled with a sand/epoxy mix and then leveled flush to the surface with the hand grinder.