This is my finished patented leather handle that had cracks. I don't have the before picture, but it was nothing special - several small ones, about 1-2 millimeters each. I did that in several steps - using a little puff paint, setting aside, sanding the top layer off when the paint was dry. The result is not ideal, but at least the cracks are gone. And with cracks on patented leather the problem is the edges are always bulging, so it's impossible to make the surface totally flat.
As much as I try avoiding patented leather, sometimes I have to deal with it. Here's my question: is it possible at all to prevent cracking? You can't use moisturizer on it - is there something that could be done at this point?