This is posted on the drag kings board, so I'm not entirely sure - is he performing, or is he trying to pass as male with false facial hair? I don't think it necessarily needs to be convincing if he is performing in it. Most of the performers I know use either fake hair or their own hair clippings attached to the face with spirit gum. From what I understand, there is a bit of a learning curve to the application.
If he's trying to pass and is wanting to use fake facial hair - I've honestly never seen any that looked really convincing to me unfortunately. Especially if it's not done well, I think it immediately draws more attention to the face and people are more curious about what's going on there.