First post, I want to cast some ribbons for some pen blanks, I'm comfortable with the technique, float it over some glass slice it while its not quite set. This is what I did last time and some of the ribbons stuck to the glass. My question is- if I use  a release spray on the glass first will I then get adhesion when I pour the second cast over the folded and curled resin ribbons or will there still be mold release present to stop the ribbons becoming incorporated fully.