Hello Wickedmama. I just had to reply here because you and I seem to be among the few, the proud, the Genuine Joye carto users.
I like these better than the Boge style because they seem to last longer between refills and give me great vapor and flavor.
Four of these will last me a full 24 hours. I have 4 Egos running all day long.
So, here is how to fill them: Pull off the rubber condoms.
You will need to remove the plastic tip. Open up a paper clip and stick it in the hole, and pull the top cap off. Then you will see another plug inside with 2 holes toward the sides. Use the paper clip again and pull that out. Note which way is up on the plug so you can replace it the same way.
Then, in the center, you will see a fill port. This has a hard plastic membrane that needs to be punctured with a very sharp object. Thats what I use the 20 gauge sharp needle for. It is a pretty tough membrane, so be careful. Just sorta push and twist the needle. The good thing is that you only need to do this once.
Then, you are ready to fill the carto. I use a blunt 18 gauge needle with a syringe. It sits perfectly on top of the fill port. Load the syringe with 1ml or so of
juice, set the needle into the fill port and slowly inject the fluid while slowly turning the carto.
Do this over a tissue or paper plate. The first fill, you will need to keep adding juice until it drips out the bottom. Thats to insure everything is saturated.
Blow out the excess into a folded tissue from the tip end. A couple of short slow blows should do it.
Wipe off the threads and replace the plug and end cap. Screw it on to the battery. On a brand new carto, take a few short non-inhaling puffs till you see good vapor.
And there you have it. I know it sounds maybe a bit complicated, but once you get the routine of it, it's a pretty quick and easy process. One carto should last a heavy user 4 hours. (Thats me, a heavy user).
If you don't want to mess with syringes and needles, well you can just turn the carto with the threads up and drip one drop at a time into the hole. It will suck the juice down into the carto. But you can't get as much juice in it. Maybe 10 drops before it stops sucking it in.
Hope this has helped you in some small way.
Oh, I forgot to answer your question. No, don't vape them until they are dry. When the taste and or vapor start to diminish, refill it. Once you know how many cartos a day you need, just fill 'em all at one time. Put the rubber condoms back on the ones not it use.