my 44 foot chung wha. has a traditional teak veneer in all the walls of the cabin. I was looking for something a little different to change your look. Something not so boring. I was curious what anybody else is using for wallcovering it would be very helpful to see some pictures
You could prep and paint the teak. However it would be an absolute sin to cover beautiful teak that they did. Find furnishings to dress up the boat.
One way to make a lot of teak more interesting is to matte the larger panels and gloss or satin the trim. If the veneer is shot from water intrusion you can prep and paint or replace, but find and stop the leak first.