You can roll or spray the wall with paint
Painting your shiplap is what makes it uniquely yours. When it comes time to paint use the square footage of your wall to determine how much paint you need. Check the paint can to see how many square feet it covers.
Before you begin painting, it's a good idea to tape off the edges of the wall and the outlets and switches. If you're using a sprayer,
you'll need to tape off significantly more than that.
If you're not using a sprayer you can use a roller to cover most of the wall and a brush to fill in the parts the roller can't get to.
You may need more than one coat to fully cover the wall.