jockhorror
Since no one else replied...
It probably doesn't matter if you skin them or use cloning powder/gel, they will produce roots anyway from any branch that is buried. As long as you leave a good part of the tops of the branches above ground, they are not going to get stunted. Once the new roots start to kick in after a few days, they should take off anyway.
I'd be careful, how much you scrape - I think you only need to take off less than 1mm?
Since no one else replied...
It probably doesn't matter if you skin them or use cloning powder/gel, they will produce roots anyway from any branch that is buried. As long as you leave a good part of the tops of the branches above ground, they are not going to get stunted. Once the new roots start to kick in after a few days, they should take off anyway.
I'd be careful, how much you scrape - I think you only need to take off less than 1mm?