I am not familiar with the Halo kit but cartomizers are pretty much the same and I have used boge cartos for a few years now. If it is leaking out then you are putting too much in. Type in "refilling cartomizers" in the search and you will find lots of info there. As for my experience with them, when I fill one for the first time it probably takes 20-30 drops. You want it to look wet on top of the filler but you don't want to see a layer of
juice sitting on the top cause that excess
juice will probably just leak out. You just want to keep the filler moist so once I have my initial fill done I usually only add a few drops just before I vape and if I vape a lot I add a few drops if it starts to look dry. It is a bit of a pain to keep checking the filler to make sure it is moist but they do work well and the flavor and vapor is good too. I have recently switched to using the Aspire bdc clearomizers most of the time and they are much simpler because they hold a lot more so you only have to refill the tank once or twice a day, depending on usage. The coil heads are very easy to replace and based on how long they have lasted for me the cost is as inexpensive as using cartos in my opinion. That might be something you want to try in the future if you aren't happy with the cartos. "pbusardo" has lots of good videos and I know he has one on filling cartos so go check out his site. Good luck and don't get discouraged. You will be an expert before you know it.
