I just ended up using a paving paint on mine. Can't remember the brand but worked really well and oil and fuel are no dramas. Even brake fluid seems ok but I do wipe spills up straight away. I do have the odd tiny spot lifting from hot tyres and right at the edge where I didn't etch it properly. It is a little bit slippery when wet but well worth the effort of covering the concrete I reckon.
Funny when the neighbours look at me weird when I am vacuuming and mopping my garage floor before I work on it. I just say "outsides mine, insides the missus." Haha