Edward, there are several replies on this very topic. On the top of the page do a search for garage floor paint. There are several great replies to this very question from homeowners such as you and from many great companies that stain, paint and seal this very item. I think you find the answers very useful.
If you do a search as Woodbridge suggests, you will likely find a recurring theme about people trying to keep dampness and water out of the basement by painting. This won't work, and you need to take care of the moisture problem before trying to paint.