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