Can you use rust-oleum epoxy shield on a painted garage floor?

What does the can say?? I put an acrylic paint on mine but it didn't have any paint on it prior. I do know you will have to remove all traces of oil, grease, dirt, loose paint, etc., from the floor first. Then you will have to use an etcher. Get it at home improvement stores. It's just some stuff you mix in water and scrub on the concrete to make very small scratches in it so the new paint will stick to it. NOW, I can tell you that even though the stuff I put down is made for garage floors and i did everything it said to do and it was brand name acrylic garage floor paint and it said it was ';hot tire pickup resistant';, the paint still came up some where the vehicle tires sat overnight. But it does look good everywhere else. A word of advise...i used a sand colored paint and i should have used a dark gray color. The sand looks good but every tire track, dirt, dried up wet puddles all show up and i have to constantly clean it up.