I don't see the need to buy a 'kit'. All you need is epoxy, sand paper, a good primer and paint.
The process is just, a readers digest version:
*clean the wheel of all dirt, grime and grease.
*dig out any holes or cracks, a deep hole seems to be better to give the epoxy more area to adhere to.
* clean again and sand all of the edges within the holes
* apply the epoxy, make sure it is really in there, then let dry
* sand, by hand, down high spots with 220 grit
* prep the wheel for primer
* after priming sand with 400 grit
* paint then apply a finish coat
I had first seen Stacy David on Gearz restore a steering wheel, its condition being of the sort which I would have thrown it a away, and made it look perfect.
The Pagoda DIY followed the same process and ended up with the same result.
The most difficult task seems to be the sanding process. I would think it easy to over sand areas and damage the grooves and finger bumps.
There was also an DIY article, in Pagoda World, on restoring the horn pad. I looked at my horn pad, 280sel, and it is different from a 230-250sl. The result was excellent.
Go to
http://www.gearztv.com/showdetails.php?episode=6
this is the episode about the steering wheel repair.
Good luck