Originally Posted by tinamaher
sorry "head". Still trying to get used to boat terminology. haha
Sorry, no walls either, bulkheads is the term you were looking for.
Being from on the other side of the pond, I had to google
sheet rock and mudding, so I think you are referring to what we call plaster board with a skim of finishing plaster on top.
This I think is really unusual on a boat, I've never seen or heard of this being used.
What year build is the boat?
Have you tried contacting the builder
for info on the original material.
Only one bulkhead treated this way, are the others still original, some pics might be helpful
First port of call would be call the builders.