That's your call, and why I don't usually use TN in places that will experience heat. I've seen 1/2" nylon strap continue to hold a load when 2/3 of it is missing. :y:
Just replace it - Tubular nylon is a lot cheaper than a rocket.
I've had fellow club members refer to TN as 'single-use shock cord'. After a couple of separation failures, I'm inclined to agree. What I did was buy a spool of the stuff on ebay. That makes me less reluctant to change it out. I don't remember what I paid for the spool, but *certainly* less than the cost to replace a J-powered rocket that separates...<g>