So I keep reading about people using honey as an antibacterial/antifungal agent when rooting cuttings.  If this is the case (I'm not saying it is, just that I've read it), would the honeycomb make a good sealant for gaps when grafting?  Has anyone tried this?  I did some Google searches, but I've only been able to find one link suggesting spreading honey on a graft is beneficial.

You could be on to something.

I use bee's wax. Works great for me

Does bees wax have any residual honey?

How about regular candle wax?

James... I use Parafilm when I graft...it's a type of parafin wax that has been turned into a thin stretchable tape...I'm not sure but it could be based on bee's wax...

I am familiar with Parafilm.  I chose to use some plastic marking tape and glue instead.  I was thinking more in terms of filling in gaps in the wood when doing rind and cleft grafts.  Some people use candle or parafin wax.  I think there are some wound sealing compounds that are also used, but the honeycomb would (should) take care of keeping the wound free of pathogens until it heals... it's just a thought.