The ceiling of a manufactured home has been patched. A high gloss paint will be used for final finishing. What can be done to eliminate shadowing caused by the difference in texture and posporicity between gypsum board paper and joint compound materials?

The ceiling of a manufactured home has been patched. A high gloss paint will be used for final finishing. What can be done to eliminate shadowing caused by the difference in texture and posporicity between gypsum board paper and joint compound materials?