How to paint wall to look like a ship lap?
Kathy, here you go. Hope this helps! https://www.hometalk.com/7147289/diy-ship-lap-wall-detail
You can use a Sharpie marker to make your walls look like you have installed ship lap.
Add lines with a Sharpie or pencil and smudge it are the two most common things I have seen.
Paint it all white then about every 8 inches paint lite gray lines to look like the slats itshould look like it.