Hong, I personally use Dow-Corning 734 silicone sealant/adhesive and it works great for attaching PDMS to platinum-cured silicone tubing, so I am sure that it will work well for PDMS-PDMS bonding. It is also a PDMS-based polymer, so less concern for biocompatibility... Philip D. Hewes Department of Biomedical Engineering (Undergraduate) University of Michigan: School of Engineering