A Green Card holder who is not a minor can file Form N-400, Application for Naturalization, to obtain US citizenship. Similarly, he must have become a permanent resident before five years and must have remained as a permanent resident in America for at least five long years.
Now, flat paint is (usually) a latex paint that dries without a reflective finish-that's it-the finish is smoother (imho) than chalk paint. Chalk paint really dries quickly and it has a rough texture to it after it dries. Many people use wax or poly-acrylic sealant on top of their furniture piece to keep the paint from peeling. So there ya go, my best explanation.
Though alkyd paints are known as oil based paints, they actually do not contain any oil in the basic composition. Alkyd paints differ from latex based paints in several aspects, including the thinner and binder used in the paint. The thinner improves the texture and flow of the paint so that it is easy to apply. In latex paints, the thinner is water, which evaporates once the paint has been applied onto a surface.