CPES on bulkhead 

In the following pictures, you can see where the bulk of it was damaged due to water ingress. You can also see a piece of wood scarf in to the Middle of the bulkhead where the damage was the worst. Where the put locker for a lot a lot of water to soak into the bulkhead. Today I tried using the CPS to seal the wood before replacing the faring pieces. I am worried that it will leave a stain it will show through after I have finished this with Cetol.