I repotted the cling-wrap experiment ficus today. Result was approx. 50% success... About half of the new roots has dried up but there were also a bunch of healthy survivors in the right places. Results would have been better if I didn't remove the wrap the day before I went on vacation and then were too lazy to water frequently enough for the following monts but I still think the technique is solid.
First step: pull it out of the pot.
Some new roots dried up, some did not.
After cleaning up the root mass. Ficus benjamina roots grow fat and fleshy if you let them grow out so I cut them back really hard at repotting.
Close-up: All those smaller roots high on the sub-trunk is from the cling-wrap method. In two years they will have grown thick enough to form a better surface line of roots and making this composition look more like a classic twin-trunk type. My long time plan for this plant is to make it the main tree in a forest planting. I have rooted 8 cuttings this spring that will build the rest of the trees.