I'm happy to help you with SugarVeil. In a nutshell, here are some basics: if SugarVeill sticks at all to the mat, it simply means it is not yet set, and you need to dry out the surrounding air by turning an oven on nearby, and/or having a fan blow across the mat. Or if you turn on only the light in your oven, it becomes a big food dehydrator that's great to use to set SugarVeil when you have lots of humidity.
When SugarVeil is set, it will be dry to the touch, not stretch out of shape, and peel easily from the mat. If you don't want to use it right away, place it between sheets of parchment in a zipped bag to keep it flexible - otherwise it will pass the set stage and dry out, which is what you noticed when it became stiff and broke.
Here are tips for working with SugarVeil: http://www.facebook.com/SugarVeilicing/notes
. Also, please take a look at our Facebook page www.facebook.com/sugarveilicing
and read about beginners just like you who first had a few SugarVeil questions (which are usually easily answered) and then posted photos of their wonderful results. SugarVeil is unlike any other product used for decorating. It's like going from buttercream to fondant - a new process to learn that will give you many new things to add to your cake decorating toolbox.
I am currently doing a tradeshow, but if you PM me your tel number, I'll be happy to call you when I can and assist you personally.
Thank you for your post - I am pleased I discovered it so I can help you out.