What are the uses of this product and can you color it with gel colors??

yes you can use the gels, if you want to make something like water or thin decorations, such as something dripping, you can thin your butter cream with it for a thin consistancy sp, and you can us it if you want to make a transfer for a cake you put it on your design flip it over onto the cake and it will give you the lines to follow, you can see a rainbow cake on wilton page for the cake in the first class. if you read on the back of the piping get it's mostly karo syrup

Link to product description: http://www.wilton.com/store/site/product.cfm?id=3E30E850-475A-BAC0-582D80C4F0374347&killnav=1