You really do need to roll it - if you sew the GGR straight on the fabric, if/when the tarp flaps around in the wind, that snapping effect puts and enormous amount of load of the fabric and will pull the ribbon right off the fabric as it unravels due to the force.
For that roll, it doesn't need to be a perfect job, so if you pin it/iron it to get it close, and give it a roll or two, it should be fine. Then apply the GGR and hopefully it won't be too puckered.
I ruined my first few tarps before I realized that you had to roll it, so let our mistakes be your knowledge!
Brian
OES
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