I just finished pouring the concrete floor for my new shop last week and I used a product called J-35 which is a concrete sealer. This stuff works great and comes in gloss or matte finish. You can put it on with a roller or pump up type metal spray can (make sure you use a metal can because it eats plastic). Here is a link:
http://www.daytonsuperior.com/c06_Fi...4_J-35OTC.html