Thanks Graham for cleaning up my posts , I ran a few cars with stock magnets and they ran the same as on a SCX plastic track. Another disadvantage that I found with the PVC is that it is difficult to fill any holes that you make to match the surrounding plastic. With MDF you can fill the holes and then paint the track and the holes basically disappear. It was rather easy making the straight section that I added but it would be difficult to do turns with out the help of a CNC router.