What material are you guys using to repair steering wheels? I've used a couple of different products that work ok but always seem to shrink or swell showing the outline of the repair. Anything out there that doesn't do that?

Do a search here.
Everything you apply to just the cracks will end up showing/splitting. One guy here does restorations and wraps the entire wheel after repairs, then finishes! He posted about this a month or 2 back...