Kenn, What I heard a couple of years ago is not to use grafting wax or sealers on cut tree branches. It seems that letting the wound heal in the air is better than sealing it. Cannot give you the reference because it was some years ago. I have not used wound sealer since and have had no problems with my fruit trees. Keeping the saw or pruner clean is important, so disease does not spread. I would check with a local professional grower for the latest on this. Bill T Bath, ME