I spot checked for grease and oill spots cleaned them with mineral spirits. Then I cleaned entire floor with the etch that came with the kit; scubbing the floor in both directions and once during first rinse. After each section was etched and rinsed I rinsed entire floor two more time and...
I just applied epoxy garage floor coating and everything went well. That is up until the last section. There was a 3"x 3" spot that when i back rolled would come off. It has to be some kind of grease or oil that I missed. I just covered it because it was a little to late to do anything else. Is...