I had a shock cord break on time during a bad blow with rain comming off the lake I was camping beside. Good thing that it was spring and not too cold and that the car was nearby, because everything got completely soaked.
I don't like the idea of shock cord too much, but in looking at dyneema tarps at Hammock gear - they highly recomend using it at each tie out to prevent long term stress damage.
To quote their page:
"Dyneema® composite has zero stretch to eliminate sagging when wet. Because of this quality, we also highly recommend adding shock cord loops to all tie-put points for added protection from damage in high-winds. It is equally important to not overtighten tie-out point as this can compromise the material over time."
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