I recently moved my 90 gallon aquarium to a different part of the house and noticed some staining on the wall from saltwater splash. I clean off all of the excess salt and gave the wall a good scrub. It looked better but you could still see what I would assume is just a water stain on the wall. Last week I painted the room with a latex indoor paint. Although the stain is less noticeable after a coat of paint, you can still see it. Any tips for how I can eliminate the stain? Do I need more coats of paint? Should I try and seal it with a primer? If so any good recommendations? I'm putting the house on the market soon so I'd to avoid questions from buyers about the stain on the wall