The Curious Case of the Creeping Crud

A month or so after Irma, we were down to our routine checking in on boat and putting Humpty Dumpty back together and I noticed a very ominous stain in the wood veneer of our back cabin.

Oh, crap.

We's got a big leak.  I placed painter's tape to mark the boundaries so we could see if it was done or it expanded.

The veneer never felt wet, but over the next few months we notice it would expand/morph/move.  A couple of big thunderstorms had moved through during that time, so we new more water was getting in but how.

The obvious suspect was the portholes, so that's what we went after first.

When we first noticed, the stain was around the corner and also down to where the tape was.

I've encounter wood stains/rot/mildew, but this is just weird.