I tried it yesterday on vellum and it worked out quite well. I did use it to make a shake though and it was too sticky on both sides for that. Don't know why I thought I'd sprayed carefully. I used an extra pair of Pampered Chef bamboo tongs for holding the piece while I sprayed to keep my finger from getting sticky. I just marked them spray glue for future use. On larger pieces of vellum the spray showed through, but on the small strips I couldn't tell.
Lynne