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I would echo what maxbrown said. I have yet to start importing Sk to UE. However, in doing so in Eon Vue, and have tried other render engines I would recommend:
1 Always build solids.
2 use the plugin Solid Inspector.
3 Then check if it is a solid using a solid tool.
4 If not, but solid inspector says its solid, make the mesh see through, cut a hole on the face, and then Solid Inspector will show the problem (as well as the hole).
5 Use the plugin Material Tools. On individual groups or components use ‘Remove backface material’.
6 ‘Fly’ inside the model, and make sure there are no materials assigned to the backface – other then the default.
If you follow these steps you will cut down on z-fighting or moire flicker.