Sorry about that. I confused this with the RPG. In the RPG, you can't repair anything if you have failed doing so and yes, in the RPG, you use another skill that Survival (the RPG has more skills). In Zone Wars, I don't think there is a limit to how many tries to repairing an item you can do, because you only have x number of rounds in each scenario.Oh wow, I missed the perma damage if you fail part in the instructions!