Posted: 08/07/2012 at 21:18
Yes, we have some hypertufa ones still going strong after a good few years. We also coated some old sinks with it, that is now coming off and needs replacing, but has lasted at least 10 years if not longer.
They are a bit of a fiidle to make, but not that much, two supported boxes, one inside the other and the cement peat mix between the two - if making a big one some chicken wire in the mixture helps to hold it in place. Good, effective, inexpensive way of making expensive looking troughs.
There are almost certainly some websites available with the proper way of doing it, and equally probably some charity shops have dear Geoff's books in stock - I would not be without mine, my gardening hero was Geoff, still is I suppose