Some reading
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http://pipesmagazine.com/blog/put-that-in-your-pipe/a-tale-of-two-syrups-casings-and-top-dressings/
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http://www.ussmokeless.com/en/cms/Products/Ingredients_Nav/Ingredients/default.aspx
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http://tobaccodocuments.org/rjr/506523494-3505.html
You are trying to give your tobacco a rum flavor ? ?
Rum is a very common flavoring in many kinds of tobacco, The simplest way is just to spray your tobacco down with rum and let dry back down to normal storage levels, Sugar(s) are in almost every recipe I have ever heard of
Im guessing your trying to duplicate a product ? ? In that caes their are many, many commercial product recipes posted online which would be a good place to start