I'm going to start sealing the ends of my fig branches after I take cuttings in hopes of preventing dieback.  Is there any particular type of wax that's best for this?  Thanks.

When I seal up cuttings I use crayon wax it has worked out okay till the cutting losses a bit of moisture then it just cracks and comes off. I'm thinking toilet wax because it's waterproof and is pliable.

I've used blocks of paraffin wax from OSH or Home Depot, melted slightly over a candle flame and then quickly rubbed into the top cut ends of cuttings. Occasionally I get lazy, just burn a regular wax candle for a bit, blow it out and dip the cuttings in the wax puddle while it's still warm. I haven't noticed any difference in outcome. I also stretch Parafilm over the cutting portion exposed above soil to prevent desiccation, and the buds push through it just fine. 

Never mind my answer I misread the post and thought it was referring to sealing cuttings.

Here in Louisiana we use tar. Last forever and drys aftet a few days. You can buy it buy the quart

How about a candle wax. 
I just used a day ago a 4" diameter wax candle. After a couple of minutes it made a 1.5" dia melted wax puddle where I kept dipping the cuttings tips. It was difficult to avoid a bit fat coating but otherwise it was very easy process. I hope those who will receive cuttings from me in trade next week will give me feed back like "Don't do it again like this, or it was a bit OK).

Use Parafilm,much less of a mess.

http://www.amazon.com/Parafilm-M-all-purpose-laboratory-film/dp/B006RAXTFU

Tyro
The product you mentioned may be good for the cutting body.The first post is mentioning the cuttings 'ends' coverage.

Just realized you were asking about outdoor trees, not cuttings. Why not a pruning sealer like this one:
http://www.amazon.com/Bonide-225-16-Ounce-Pruning-Sealer/dp/B000BZ1JKY/ref=pd_bxgy_86_2?ie=UTF8&refRID=1YTA4QMW75CKYKX9SK13

You could get the spray bottle kind, or the kind you use with a paint brush. 

I misread the beginning and thought of cuttings end.
Yes,that was the problem I posted in a thread, die back after taking cuttings; most probably due to desiccation. 
 Too late this year for me. I hope good suggestions come in this thread for next year use.

I have a big jar of grafting wax that I never opened. I will try that with easy application.

Parafilm works fine for anything under 1 1/2".It allows gas exchange and prevents moisture ingress.
By the time it breaks down the wound has already sealed.I use it when I'm structuring smaller tree's
and have cut too close to the bud I want to break out.

Thanks.  I also thought of wood glue.  It would be a lot easier to apply.  Others have suggested liquid electrical tape.  This is for potted trees that will be inside a cold garage.  Akram and I had the same trouble last year.  I think I'll try wood glue and LET and maybe toilet wax (also recommended by others - good thinking, Matthew!) to see which works best.  I'll let you know in the Spring  :)

You can easily make your own organic sealer and a slight variation to deal with the pruning cuts, wounds etc..Here where I am these store bought products are  expensive
All those ingredients are cheap, easy to put together and we do learn something...

I have always used the scented paraffin wax from my wife's heated bathroom scenter. Works great and costs me nothing...except for when she buys the refills... after all, paraffin is paraffin...it is a fungible commodity.