Try some Dawn dish soap. I used it to help slide my awning bag into the track. I also used it for the j channel on the bottom when I replaced the canvas on my Jayco. You don't need to slather it on, a little goes a long way. I used my finger to spread it on the welt. It also helps to have the roof lower so it is easier to work with, and a helper to keep it level as you work with it.