I was changing my tank on my 72 and the build sheet came off. The sheet is intact and you can read 95% of the information. It is however very very brittle. It is in plastic in a book at present. Does anyone know if there is a way to preserve it. If it stays in the plastitic and is handed at all it will break up. Is there something such as a clear coating or something to spray on it to keep it together.
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