I haven't forgotten to post back with my results. I have just been so busy. I apologize.
I just got done with my "test". I took a large circle stamp (i wanted to make sure I had enough of an area to do the test). I applied versamark numerous times to make sure I had a good coating. Stamped my cardstock and poured the crystal shimmer over the image. Turned the paper over and about 95% slid right off. That's how big this stuff is. lol When I went to use the heat tool, I started with the underside then brought it to the top. The stuff blew off. :::sigh::
WAVEJUMPER: I will try the link you supplied and report back if I get an ans.
As far as the age of this stuff goes, I really don't know. It came to me in a box lot of stuff I purchased. I just tossed in with my embossing powders and forgot all about it
until now.
SCRAPJANNY: I googled the sugar dust and this stuff is nothing close. I was describing it as like a kosher salt but its really more like rock salt.
Thank you ALL so much for taking the time to help out. I really appreciate it.