Sliding chalice door is concrete to slide. Any suggestions? ...
Answers: Clean the track and use powdered graphite. Do not use oils or any other "wet" treatment. It will only collect dirt and dust and you will be right back to a sticky door.
Clean the track and manufacture sure your house hasnt settled and warped the framing cause the door to be "pinched". Warning, do not use oil, it will create dust and dirt to stick to the wheel and exact it to stop rolling freely.