I am trying to create a 0.1mm thick PDMS layer on a 3D printed mold (made from photopolymer resin of B9 creator). Although the PDMS layer is curing, I am finding it difficult to peel the thin layer. I apply a release spray on the surface of the mold before proceeding with spincoating the PDMS layer. What methods can be done in order to obtain such thin thicknesses? What release agents can be used or reagents that can help in the liftoff process of the PDMS layer?