This delicate little slab is more engaging than it looks. There are lots of tiny holds that seem unfeasible, but there's everything that you need for small fingers and feet.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.