As cathartic as it would be, it's not ok. It would only make you look like you were incompetent at dealing with awkward situations. Not a good result for you a

As cathartic as it would be, it's not ok. It would only make you look like you were incompetent at dealing with awkward situations. Not a good result for you after all you have put up with. While you may have been boiling with anger as they have been testing your patience for some time, it's not a good idea to go from zero to rage in one go. E-mail the person your colleague reports to (hopefully they will have had first hand experience for the incompetence), explain in confidence you are having a few issues with this colleague of yours, say you're being patient and want to resolve the tension, however there has been a long undocumented string of occasions where you have had to fix their work & pick up the slack. Add that you've attempted to bring this to their attention in a friendly manner but it has not improved the situation. Explain that you will now re-focus on your own work and that while you will continue to be friendly and supportive you do not have the capacity to assist as you have been doing. Sign off by telling them that you require their support to rectify this issue, that you will keep them updated and will document any examples of the situation escalating. Ensure you only ever remind your colleague of errors they need to rectify by e-mail so you can keep responses. Don't let them drag you down (work wise or emotionally) if you handle this with just the facts, no blame, they are then solely responsible for their own downfall.