It might just be my misunderstanding of ArtAttack, but I was under the impression that PVA glue was glue with water mixed into it? Was I wrong?
Ah, as I mentioned above, concealer doesn't look to pretty overtop the glue, because concealer itself isn't too thick (so it doesn't clog pores). Infact, it's rather see through. Have you tried a skin colour paint yet?
Make sure your paint isn't too watery as the more watery it is, the more layers you'll have to paint on (hence why tempura and watercolour paints don't work at all).
Hope that helps