Concrete floors can be painted with the right prep. Knowing if it is necessary to acid wash the concrete floor before painting it can save enormous time and money...
Is It Necessary To Acid Wash My Bedroom Concrete Floor Before Painting It?
What Is The Best Paint and Prep For Concrete?
If professional grade concrete floor prep cannot be done then I would use Bio Poly Natural. With that product the concrete just needs to be raw, absorptive so it can soak in. That makes a real nice finish that is easy to apply, maintain and it doesn't run the risk of peeling.
The Painters Library 