I would be interested in an answer too ^^ I am thinking of getting some Rhino skin solution for the next trip?!
No Climbing Today!
^
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.