Is lip balm that you put on your dry lips a barrier for water during ghusul? I put some on my lips around 40 minutes before doing ghusul. I didn't think much about it until after doing the ghusul.

I did wash my lips normally during ghusul (as one should) but afterwards I could feel a little bit of the lip balm (though I don't think there was a visible barrier or anything thick)

If you think that it was not a barrier than your ghusl was correct