have you ever tried to duplicate your customers   favorite thumb? with vise it takes over night to make the plug but with  Pro Edge It just takes 30 min and your plug is ready to make a duplicate  thumb. Pro Edge also has a 30-45 minute plug which this summer seamed  not to get sticky in the hot and humid bowling centers here in Texas.  All in all the materials that Pro edge sells has a longer shelf life is  and fool proof as it comes out of a two part gun and mixes with out  mixing. This is the best kit for the job hands down , check them out.                                                              http://proedgebowling.com/product-info.shtml