Yes you can go through it its very save and sound.
Any area you feel that visible you can spread the black fiber to conceal the bald patch on hair unit. But the main problem is look creation. Suppose one can have the spiky look and hair fall out after few months and area gonna visible then use of black fiber to hide the area but no stand hair at all. whereas for simple side partition look it is very useful to spread black fiber on it. We showed you the photos.