Gracias!I have used Renovateur on museum calf and haven't had any problems. I do follow what the jar says, just leave it on 3 minutes and then buff/brush away. Having said that, I use for general conditioning purposes Bick4. Renovateur, as the name suggest is to "renovate" so, unless I have some seriously damaged shoes or bought some second hand ones, I will use Renovateur.
Yeah there are some horror stories regarding renovateur but most involve crust leather.