Pryncyss

XBox One player here. So, my version is way outdated. But, I still love this game. I know that loot doesn't re-spawn when near it, so I assumed the same thing would be true with the traders. I have purchased the reinforced steel upgrade from all the traders I have found. I am on day 276 and have stayed away from all the traders many 7 days, hoping it would respawn so I could purchase more. This has not been the case so far. Does reinforced steel respawn at the traders? If I can't repair what I'd like to upgrade in the future, then there is no point to even using it. Thanks for your help!