I apologize for my ignorance, but is this TE armor Styrene or ABS? Here's a trick that I have used on ABS armor. (not sure if styrene has the same properties.) Take some scrap ABS and whittle it with a razor knife to produce a small pile of plastic shavings. Next get yourself some 100% acetone. Place the shavings in a GLASS bowl and add just enough acetone to make a paste. The acetone will break down the ABS into a liquid form. Using a toothpick, "roll" the liquid ABS into the cracks and allow to cure. As the Acetone evaporates, (fairly quickly) the ABS will return to it's solid form once again. Then, you can sand, polish, and paint the repair as you see fit. (it actually sets up with a glossy finish.) It's an old model builder's trick that I've applied to costuming.