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What do you want to achieve?
I want to know if making it watertight even really matters, if UGC allows double-sided meshes and if I need to make any other changes -
What is the issue?
I have an exposed plane with normals I cant properly flip without it looking bad. -
What solutions have you tried so far?
I tried using the solidify modifier with and without specific vertex groups on, extruding the faces and separating the collar.