Bicycles are minimalist structures by design. A tube or component cracks because it's either been catastrophically damaged, or fatigued due to reaching the end of its useful life. Honestly, patching with JB Weld or freaking tape is a rather pathetic and sketchy temporary fix that's just asking for trouble if you trust it. You need to look deeper and understand why something failed and then deal with it responsibly, not just slap a band-aid on it and say "yup, that'll do er."