I had that happen twice. but nothing broke in tube. I figured what happened was a piece of copper got caught beween fingers on bottle holder & Bottle. I fixed mine buy using a fine 00 pinstripe brush & good quality Automotive Clear that's Catalyzed Urethane. It worked good, barely noticeable. BUT, For me I have easy access to such materials as I'm a Automotive Painter for past 40 Years. For anyone else this method may be quit difficult to perform. LEON.