aemeijers wrote:

From reports on here, and from people in the real world, I get the impression
that the success rate on old concrete is mixed at best.

As with any coating, 90% of the effort is in the prep. If you have a seriously
oil stained floor, you need to do some serious cleaning, which may of may not
include shot blasting the concrete.

At a minimum, you need to acid etch, neutralize and TSP it.