[snip)
http://tinyurl.com/yhkk5c6
The solution by another post was well I came up with an interesting
and effective solution all by my lonesome!  I purchased some of those
plastic carpet protectors with the  spikes on the bottom, and
fashioned "arm covers" out of them with the spikes sticking out.  They
sit on the corners of the couch in the areas  where the cats like to
scratch (both on the arms and the back corners of the one couch that
floats).  They are pretty sturdy so I was able to cut, bend and staple
them into form fitting covers without having to do a thing to the
leather.  I can remove them just by lifting them off when I want to.
The cats are both using the heck out of the scratchers now, and
hopefully I will be able to remove the protection after a few months
and they will have successfully been "trained."  Woot!
Petzl
--
Our parliaments need to obey our Constitutions,
the judiciary must apply the law
"Dieu est mon droit"

I use this too. Target sells a brand of tape for about $5 per roll;
must cheaper than Sticky Paws brand and it works just as well IMO.

Also, you need to have a scratcher that the cats want/like to use
right near those spots on the couch. Once they are using that
scratcher instead, slowly remove sections of the tape and they will
leave the couch alone.