Don't worry about the flex additive. The properties of the flex additive only last for several days to weeks.
It's mainly good for polyeurathane bumpers. So the paint bends while your are getting the bumper mounted to the body. If you notice, those bumpers start showing spider cracks after a while even mounted firmly to the body. And if you bump anything, you get the cracks right away.
The easiest way to restore the steering wheel is to clean out the cracks and make a "V" cut into the crack. Fill it with body filler, prime, sand and finish just like you would with a car body. It'll look great and last a long time.
If you like leather steering wheels, go to Wheelskins.com and take a look at their covers. I have one on my car and looks like factory. I love the way it looks and so does everyone that has seen it.
Frank
