Oh, I forgot about your bronze blaster. For metal, use JB Weld, when it dries, it's more or less steel, it's made for gluing together metals. I also use it when I need something to really stick to another.
My toe spikes broke once and I just glued them back together with JB Weld. No matter how many times I accidentally kick something, they haven't broken since. With my FP armour, I filled the dents on the backplate with JB Weld, it holds 20 times better than Bondo. The only down part is that it takes about 24 hours to dry. They make "JB Weld Quick," but if you want it to dry in 5 minutes, you're giving up durability.