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.
In most cases, the right type of paint for a ceiling is a flat, matte acrylic paint. Flat paint produces an even finish that doesnât reflect light or create distracting glare. Itâs also able to hide imperfections in the ceiling better than some other types of paint, which is useful if you live in an older home where the ceiling is slightly warped.