I am something of an expert at leaking and have learned that if a device has the potential to leak, I can get it to pour. That's the bad news. The good news is that it's easy to fix the leaks, to learn to prevent the leaks, and to clear up and stop the leaks. Recommend you review Youtube review videos on your specific toppers and that will help you with understanding where, why and how they leak. Once you learn and implement these "corrections", it becomes, in time, second nature, and I don't even notice it anymore, correcting as quickly as it may happen. I certainly don't get frustrated any more. Given the heat, the pressure, the liquid, and the relative inexpense of these devices, you are going to get leaking. Being a happy vaper is learning how to correct these issues as they occur. I'm in love with vaping, and grateful beyond words that I no longer smoke. My 19th attempt at quitting was vaping. I haven't looked back, and I'm certainly willing to learn the ropes, so to speak, about the gear, and how to use it. Good luck to you, enjoy your videos, Power up and Vape On!