I'm an idiot. I've spent hours making a chocolate cake for my friend tomorrow (nothing fancy but it took hours because my toddler was 'helping'). It was all looking great and I was just smoothing out the chocolate frosting using a hot knife but I must have forgotten to dry the knife after dipping it in the boiling water and now the chocolate frosting has split 
It looks terrible. I tried to kind of keep spreading it around incase it was ok underneath but I've just made it worse.
Has anyone got a magic solution? I've run out of chocolate and love very rurally so it's not practical to go to the supermarket so I can't scrape it off and re-do it.