You may need to knead in a bit of shortening to soften it up a bit.
First rub some shortening on the inside of the gun, then take a small ball of paste dunk it halfway quickly in a cup of water shaking off any excess,put a little shortening on your fingers then knead it till it feels like chewing gum then roll into a log about the size of your gun hole, depress the plunger till it stops on the paste and it will flow out easily and readily just keep pumping the plunger.HTH
Duplicate post, please also see:
http://www.cakecentral.com/cake-decorating-ftopict-640012-.html
HTH
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