It's hard to believe that F2007 build has been waiting for new rear wing's main element for almost a year now. I couldn't make myself to tackle resin casting needed. I wanted to make a resin copy of part from MFH kit. Below are photos of the process and couple of test casts. As I have feared, result is not great. I will do couple more attempt on casting from this mold. Hopefully I will be able to make decent cast to use a start. It will still require quite a bit of putty work to fill all imperfections. So far my experience of making silicon mold has not been great. Still lot to learn and experiment to improve result. Lego blocks are great for making mold boxes.