Oh my no! Do not ever use any type of pain or pain-thinners inside of the house with a bird, regardless of where the bird is located in the house, or how many doors are shut, what floor you're on, etc.! You must paint outside or in a garage or shed that is separate from the house! One whiff of paint/pain-thinner and your bird could die very quickly, and those fumes travel under doors/through door-cracks, up and down floors, etc. Certainly not at all worth the risk, same as having your bird anywhere inside the house/apartment while you're cooking with a non-stick pot/pan that has a Teflon coating...