Re: Goliath vignette
Something does look really wrong there, the way it's still wet...
but, I think you could save it with very little trouble. the Yellow should easily come off without much effort, maybe a coffee mug of water (or any small container just in case that wonderful PE lid comes off) a soft brush or old toothbrush even and it should go no further than that. You would be left with what you started with, the rust color which should be fine as it looks to be holding fast?
Then, test the colors you mixed separately on something scrap to discover the bad bottle. If they are fine, test the worn effects again, it may be the culprit. If that appears fine well... try again with more dry time in between each layer?
I wouldn't give up on the can though, that yellow should come right off and leave you with the rust colored can to start again. Hopefully.