Little guide i wrote for someone yesterday:
For carto's i always used:
Boge Pre-Punched Cartomisers (5) £6.99 - Vaping Spares - Cartomisers Electronic Cigarettes | Vaping Devices | Accessories | E-Liquid
Non punched carto’s i would use these in silver:
Boge 510 Standard Resistance (5) £5.99 - Vaping Spares - Cartomisers Electronic Cigarettes | Vaping Devices | Accessories | E-Liquid
I would punch them 1 x 2mm hole (No bigger and No smaller), a 2mm hole should accommodate most thickness of juices.
Once the carto is punched i would fill them using the condom method and leave to rest for 20-30 mins, once rested make sure there is no flooding, good idea is to vape the carto for a couple of seconds on it's own to make sure all is fine.
1: This applies to tanks with a filling hole at the top: If the carto is fine and good to go fit it into the tank and screw tank lid on (only fill tank with the hole provided on top of the cap).
2: This applies to tanks without a filling hole at the top: If the carto is fine and good to go fit it into the tank too about 70% in so there is just enough room at the top too fill the juice into tank (Recommend to use a needle cap filler or syringe).
Fill tank too around 60-70%, i prefer 60%, i tend to find the more you fill it the more chance of flooding (think it is to do with pressure).
Leave to rest in the tank for awhile to let the carto adjust to it and then try it out.
You can also before starting to use it is do the dry vaping, by blocking the bottom of the carto hole (when it's in the tank) vape until you see no more bubbles come out of the punched hole, like this video here:
How to prime and fill a DCT (dual coil Cartomizer tank) - YouTube
Another video on tanks here:
Maximizing Your Cartomizer Tank Vaping Experience! - YouTube
The other reason i fill to around 60% is because IF it does feel like it is flooding you can tilt the tank and vape only the juice from the carto which will empty the extra juice in the carto, if the tank was 100% full you could not do this because there is no empty room left so it will just keep pulling in more juice from the tank.
Gotta just remember that the Carto is like a submarine in water and all that juice is wanting to get in, so when vaping with a tank it's best not to fast vape continuously as you will be pulling in loads of juice too much and too often.
Hope some of this helps.