GRAFTING COVER COMPOUND
I'VE SEEN THE YOU TUBE (https://www.youtube.com/watch?v=1588Hbzjtsk) OF ROBBI VAN TIMMEREN, MIDWEST AREA GRAFTER EXPERT, ABOUT BRIDGE GRAFTING AND LIKE TO KNOW WHAT PASTE/PRODUCT/COMPOUND SHE USES TO COVER THE GRAFTS, BUT I CAN'T FIND HER CONTACT INFO.
We do not have the contact information you are looking for. The video looks commercial and not university based.
It may be helpful to look at the attached link from the U of Minnesota. They have some information on grafting tools and supplies. You can also contact fruit tree nurseries in your area for more information.