Pastrychef.com has it for about 28.00, and you can keyword chocolate freeze spray.
Don't know about holding the sugar together; I'm thinking no, because sugar needs to harden, and I think it does that with time, not with cold. But I'm not a sugarwork expert...anyone?? anyone??
No it will not work on sugar pieces unless you want to ruin them. Best way to preserve sugar pieces is to use sodium choloride, lime rocks or silca gels place a piece of wax paper between the inhibitor and your work. If your wanting to hold the molds together use a propane torch and a knife that you don't want, heat the knife tip to red hot and run it quickly over the piece to be glued then stick it quickly in place you may have to hold it for few seconds.
you do not need to buy this from a pastry store. you can get it, and get it CHEAP from staples, office depot, walmart, etc. It is what they sell to "clean electronics/keyboard" it is exactly the same thing.
I used a can of the stuff you get at the office supply store and it worked; HOWEVER they add a bitterant to it, so it makes it completely inedible. Buy the food safe stuff or make sure you don't have one with the bitterant.