Sit start as for Surf Betty, but make an extra couple of moves left along the undercut. Using patina crimps move around under the lip, and exit to the right, at an obvious bucket on the top.
I found this quite a bit harder than Surf Betty because I couldn't keep my feet on with my hands on the top. Taller folk seem to find it somewhat easier. The beta I used makes up for the difficulty, because it is so sweet, and big guys miss out!! I found I could get a heel-toe cam in under the undercling for the move around under the arete. Then, forget the feet, campussing is easier!
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.