If you didn't know wicking, it's a common thing when it comes to vaping. Those who have been vaping for years probably have a good idea of what wicking is, but for those who are new to the whole wicking game, this is a good guide for you. wicking is basically the cotton in your vape. It should be changed periodically. The different types of wicking and methods are as follows:
Dual Coil Standard Wick
Stick your cotton through the coil, it's okay you have a littler resistance but
not a lot. Then cut it so you have enough to tuck under the coil. Make sure the cotton is rolled skinny enough to stick through the coil also. This is the best way to wick a standard dual coil.
Dual Coil: The Roller-coaster or The over under:
You need a longer strip of cotton which you will wick with the same piece.
Pull it through the coil, cut to tuck. This is really good for RDA's that have
a particular cap. Bring the cotton over the top and then wrap it back through the other coil. You can use a set of tweezers if necessary to guide you along. Cut off any excess and tuck, so you have room for juice. Once you get juice on it will be easier.
Wicking is an important part of coil building. You have to wick it correctly or it won't perform how you expect. To recap, wicking is the part that absorbs all of your e-liquid and brings those liquids to your coil. You could use some other materials but the best that is popular right now is cotton. Pay attention to how much cotton you use. This can affect how well your coils vape. You can get a really disgusting dry hit when you use too much cotton. You will know from the taste in your mouth, its' not pretty.
Make sure all of your settings are in line and you have a good saturation of coils. Please note, if there is way too much cotton in the middle of the coil, you are basically choking off the wicks and not enough juice or liquid is hitting the coils. You can end up vaping or burning cotton. Way too much cotton kills the flavor. Again, if you pull back on the cotton use, then you will experience a lot of dry hits.
Leaking is also an issue if you are using too little cotton, the juice will not flow properly. Most times if your tank is leaking, it is because it is not wicked correctly and you need to fix it. Find a happy medium, but have a little resistance when pulling your cotton through. If you are cutting your cotton, use tweezers to allow the juice to flow. Having a little bit of space can really help with airflow and help juice go through the tunnel.
Overall, there are many wicking methods, as given above, but consider others that might work with your mechanism to give you a good vape all the time.