My 200 year old home has stretched canvas ceilings in the dining room and living room--it is not canvas applied to a board; a yardstick carefully placed against the ceiling will actually lift the canvas. They are beautiful and in pretty good shape and you'd never believe they were canvas unless you did the yardstick trick. I am having the entire house painted and the wood floors throughout refinished. How do I paint these canvas ceilings or should I just leave them alone?