You don't cure the leaves. You have to wrap them fresh.
There's probably a bunch of ways to do it, but I grind cured bud, bind it together with thc oil, wrap it in sugar leaves, tie some skewer sticks around to keep it from falling apart, then let that cure for a day or 2 in the dark in curing temps and humidity.
Take off the sticks, coat it in oil again, then cut the fan leaf and wrap it. Coat the outside with oil. Tie the skewers on, then let that cure for a while. Usually at least 2 weeks. Take off the skewers and then store.
Just like a cigar, the longer the better. Pain in the ass but for $300+ a cigar and a few for me... sometimes it's worth it haha.