Here is the grafted seedling, perky and with the grafting clips removed. Stay tuned for updates! If all goes well, we will have some great heirloom tomatoes this summer.
Here is one of the grafts that has healed. Be patient and don't try to remove the clips too soon. The graft is very fragile, and it is easy to tear the rootstock and scion apart if the graft has not healed strongly enough.
The video says to keep seedlings in the high humidity healing chamber for about 7 days. If the plants wilt after loosening the lid, put the lid back on the healing chamber and put the chamber in the dark again overnight. The plants will be perky again by morning. Then leave the plants in the sealed chamber for 2-3 more days before allowing air circulation.
Healing chamber is just a clear plastic container with a clear lid that I purchased at Target. You need something that will allow light through, but with a tight-fitting lid so that the chamber stays moist.