Dear experts, thank you for your valuable input.Preliminary results indicate that the wrinkling issue has gone away!The problem must of have been solvent residue from the development of the first layer "reacting" in some way with the SU-8 during baking.A combination of your recommendations has been successful.Thanks again and i wish you all merry christmas and a happy new year! Anthimos Kanteres Microsystems Engineering Centre Edinburgh,UK ________________________________________________________________ DISCLAIMER: This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom it is addressed. If you are not the intended recipient you are prohibited from using any of the information contained in this e-mail. In such a case, please destroy all copies in your possession and notify the sender by reply e-mail. Heriot Watt University does not accept liability or responsibility for changes made to this e-mail after it was sent, or for viruses transmitted through this e-mail. Opinions, comments, conclusions and other information in this e-mail that do not relate to the official business of Heriot Watt University are not endorsed by it. ________________________________________________________________