How about this: * White flat wall. * Gyproc has a small dent in it from a hard object bumping into the gyproc. Do I fill it in with plaster, sand down, prime and then paint over? Is there a way to make totally invisible, a lot of plaster patches I see are visible not because of size but because you can see the plaster finish being different from the rest of the wall? Any suggestions are appreciated. Thanks!