Yes, the sew foam will keep the leather parts from stretching. That's why I sew the perimeter parts to 1/4" sew foam too. I used to do that just for leather, but now I do it for everything. It just makes a higher quality job, keeps the parts from stretching too much, and pads the parts that touch the seat frame to prevent the seat cover from being cut if bumped.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 12-18-2008 at 08:23 AM.