Any MacBook purchased between October 2009 and April 2011 is eligible for free repairs of peeling bottom coming off due to issues with glue.
Apple has determined that under certain circumstances the rubber surface on some MacBooks may separate from the bottom case of the system. MacBooks shipped between October 2009 and April 2011 may experience this issue. Apple will replace the bottom case of any affected MacBook, free of charge, that exhibits the issue.
The MacBook Bottom Case Replacement Program covers the affected MacBooks for two years from original purchase date, Apple says. They will also issue a refund if you have paid for a repair or replacement due to this issue. The program does not extend your standard warranty in any way.