[cabmandone]

I just went through the whole epoxy thing. Clean it, degrease it and then grind it. Don't waste time with the floor sanders with the Diamabrush attachment. If your floor isn't PERFECTLY smooth you're wasting time. I went to Hertz rental and got a Husqvarna grinder with cutting heads. I would have saved an ENORMOUS amount of time had I gone that route first. The key is that you want to get up the sealer that is on the floor. Then you want to do a moisture entrapment test where you tape down a 3'x3' piece of plastic overnight to see if moisture wicks up. If it's dry, you're good. If there's moisture you'll want to use a water based bonding sealer. I used a system by originalcolorchips.com. It was not cheap!

BTW, the acid etch does not touch the oil. The oil has to come up with cleaner/degreaser. If you do go the acid route, rather than just rinse, get some baking soda and mix it with water to neutralize the acid. You use much less water when rinsing this way. But again, I'd just do the diamond grinding and call it a day.