How do I properly fill up a vape cartridge? Most of the vape cartridges on the market are top-fill, meaning that you will fill them from the top (underneath the mouthpiece). First, make sure your oil solution is cool before you inject any oil into the empty vape cartridge. If your solution is still warm it could damage some of the seals inside the cartridge which will cause leak issues. Second, inject the solution very slowly and on a slight angle when hand-filling to reduce back pressure on the...