The other item that works equally well for vastly less money is parchment paper for baking. It replaces 'release' paper that sells for way too much, and I reuse the two sheets I need scores of times before starting with new ones. It works perfectly, and dry mounting is done at a much lower temperature than the 350+ degrees used for baking.
What time & temperature do you use for the mounting?
If you can't find the answer in APUG then it probably is a really dumb question.