Working with a whole tin in one session meant that we were taking nearly the whole 4 hours workable time to complete the task. So we decided to only mix half a can at a time and to the second coat in two goes, one per day.
So on Wednesday we did just one side with blacking and spent the rest of the time doing other jobs such as the stern flashes. On Thursday we did the second coat on the other side and also touched up some of the other paintwork.