Walls are being painted a light tan color with a darker accent color on one wall. I have overlapped the lighter color in the corners and painted the darker accent wall. The corner of the wall has a thin (what looks like a almost white stripe down the wall from floor to ceiling) stripe in the corner. i know it was painted because i was there. Is this an illusion? Very confused. Please help and thank you.
Sounds like somebody may have caulked down that corner with silicone in a color the same or close to what the wall was. You did not notice it until you put on two darker colors?
Pure silicone is not paintable but some nice caulks have a minimum amount that keeps them flexible but still allows paint to stick. The bad news is you cannot caulk over it with paintable and then paint. If it is silicone, you will have to live with it or carve it out of there.
Pure silicone caulk is the work of the devil and all of us who painted found it in the most weird of places. It would not surprise me somebody in a hurry grabbed a tube and fixed a corner with the horrid stuff.