Shading issues on inside surfaces when using Boolean I am playing around with boolean operations, and having a shading issue on the inside of my mesh when using the difference operation to cut a section out.



I was able to fix most of my issues by using Auto Smooth as spelled out here, but this doesn't appear to affect the inside surfaces. Any suggestions for cleaning up the shading on the inside curved surface?
You could try shift  N to fix normals or removing doubles and if that does not work try adding an edge split modifier