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My DIY hex tarp is just folded and sewn - no grosgrain ribbon edging. My Speer Winter Tarp is also just folded and sewn.
With silnylon, I like to use an iron to set the folds before I sew. The material doesn't stay folded, but the fold lines are there. I find that I don't need any pins because I have those ironed-in lines to use as a guide while I'm sewing. It helps keep the hems straight.
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Doesn't someone on the forum use a glue stick to hold the edges prior to sewing? I like the idea of "spot welding" the tarp. I don't know if my wife will let me set up her sewing machine in the garage though.
I tried the fabric tacking glue. It works but then is messed up my thread injector. The needle got all sticky and the bobbin case filled with sticky debris.
Not recommended (JMO)
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On my DIY tarp I just used a rolled hem, on the edges, and I used small binder clips to hold the rolled hem before sewing. I also stiched the hem twice(evenly spaced apart) It seems to strenghten and stiffen the edgeges a bit. After all that I spray it with the silicone spray from WM (with the Blaze orage cap).
For those who have machines that can handle attachments / 2 screw holes to the right of the needle, I highly encourage spending some $ on a binder attachment. You can get cheap ones on ebay. They are cheaply made and are inexpensive. Sailrite and other marine upholstery places sell much better ones for more more money.
I have several of the cheap ones from ebay.
1" single folder handles 1" and 7/8" gross grain / twill tape / binding
3/4" single folder handles 3/4"
3/4" double folder takes a 2" or 2-1/4" strip and double folds it to a 3/4" tape. Great for making your own binding tape from scrap fabric or to match a project.
If you are making more than one tarp, you'll pay for the attachment with time saved. Pretty much feed the tape into the binder, hold the raw edge in the center of the fold and step on the gas. I can bind all sides of a tarp faster than most could even double fold and pin one side.
I also have a hemmer attachment, which is supposed to create a 1/2" double fold seam. In this case, either buying the cheap one bit me or I am doing something incorrectly, becuase I can not get it to work properly for more than about 1 foot before something goes haywire.