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Just to say that the sugar bag paper horn has now been released from the aluminium former. Unfortunately, now that we were able to view the inside, it has the looks of either the surface of the moon, or a warthogs backside! I used aluminium foil over the former before starting to paper it back in August. I have been told that The aluminium foil had not been put on the former tight enough. My own idea as to why it is so wrinkly is that when we were drying it, the horn was facing the sun in the conservatory, and the interior got very hot. My wife is on the case now. She has sourced a product, a paint with a special filler. It is applied over the whole area, and before it has dried, has to be smoothed down. I am not sure if it can be sanded after drying, but we shall see.
After the horn was released, a ring had to be made round the mouth of the horn, so a non-resonant material was used-greenhouse dribble hose! It is made of a rubber composite material, is full of minute holes, and the surface was uneven making it suitable for the application of six coats of sugar paper to help locate it after gluing the ring in place with epoxy glue.
Mr Adrian Tuddenham of Bath, a great chap who will make anything, and repair almost anything, has made me an excellent exponential former of wood and aluminium for the last foot or so of the horn, as mine was missing. I am now experimenting with various release agents to apply to the wood so that the many layers of paper that will be applied will release easily.