There is a high tenacity 2 sided tape you can buy that I also used on my first tarp ..... you stick it on the edge, then pull the tape tab off and then dour roll. You can just leave the tape right on after sewing. I found that you do need to wipe the needle every so often to make sure it doesn't get sticky.
https://www.sailrite.com/Notions/Dou...d-Basting-Tape
On the last tarp I found that just roll and pin, then roll and repin was about the easiest way to get good results on a double rolled hem (I just bought a set of rolled hem feet to try out). Although the first tarp and second tarp were the same 1.1 silpoly and using the same machine, I had little issues with slippage this time around, likely experience is playing a role.
JellyFish has a good video for slippery light fabrics (1.1, .66 oz/yd) using a tissue paper backing to address the slippage issue as well. The tissue part starts at a~1:30 .... but it is a good and short video to look at IMO.
https://www.youtube.com/watch?v=twek6taDHzQ
Brian
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