See https://en.wikipedia.org/wiki/Craquelure for an example of the real thing: this is a node group (with a sample material) to show you how it might be done with procedural textures.
See https://en.wikipedia.org/wiki/Craquelure for an example of the real thing: this is a node group (with a sample material) to show you how it might be done with procedural textures.