I'm painting the interior of our house. One room I started with the previous owner had painted it a light mushroom color. I'm painting it with a color that's a little lighter. I'm using Behr paint. I was told at Home Depot's paint department since it was already painted and similar color I don't need primer. So I painted the room two top coats. But I noticed I'm seeing (I think it was there before I painted too) a thin white line in the corners. I took several photos of the corner. Here is a link to them:
I don't know the cause of this, but I would like to cover it up with the new color. Would a Latex primer and then two top coats take care of this? Or should I go directly with an Oil primer? Or get a quarter of each and try one in each corner to see what happens? Or is there something else that should be done? Or is this an optical illusion and I'm chasing a ghost here? :-) Thanks!