Yes!!!! You can. We painted these plywood subfloors in a weekend after we pulled up the carpet.
Start by ripping up the carpet. Check to make sure the plywood is in good shape. You'll also want to remove any nails.
Yes. You want to clean the floor and remove any debris and then prime it.
You can either fill in the seams with wood filler or can you leave them plain with extra character.
There are so many good floor paints to use. Just make sure that you use a paint designed for floor
I really like to use painter's tape. It's a great way to get a clean line with the squares on the floor.
Here's the finished space. We painted the floor and added a rug for warmth. Such an affordable project.