I bought this six months ago and considering the wet weather decided I would use it. First a third of the content was in the bottle, the rest evaporated. It is impossible to remove the entire seal from the bottle. So I applied it to a desiccant filter and then found and used clear plastic wrap to attach the neck and seal the bottle. There has to be a better way, but I'll let you know if this material prevents mold. If it is worth it. June 6, 2021
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