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i had wondered if that might not happen over time.

good question. it very well may be.
it looked pretty substantial from the description & demonstration on the video.

if you mean on this tarp...
http://www.hammockforums.net/gallery/files/2/5/P9030064.JPG
yeah, the tabs (red grosgrain) were sewed right into the seams.

this is true. i used circle reinforcements on my first tarp w/ pull outs, a ray way tarp.
one thing like about the full length seam is that w/ the circle, you make a commitment to those particular...

the grip clips would be the easiest like you said & would work just fine in most cases, but if you really want to be ready for a hard wind, i think the added seam would be near bomb proof.
and what...

here is the last tarp i made...
http://www.hammockforums.net/gallery/files/2/5/P9030063.JPG

the purpose for the extra seam (about 1' above the edge) was to be able to add a short wall (about 3...