No, you don't have ghosts, but when we're finished you will wish you did. Just kidding. We have to assume that the three color painting detail to which you refer is sponge or splatter paint. We assume this because the glaze that is used with sponge or splatter paint? Once painted? Will render the crackling effect you are experiencing. Now that you know the cause of the problem all you have to do is eliminate it? The cause that is. The problem will then go away. There are several ways to do this: You can sand? Yuck, very messy. Or, you can use paint remover? Yikes, even messier. Or, you can try to encapsulate the problem by painting it with a material that will not be affected by the existing glaze. This we think would be the easiest. Try using a coat of OIL BASE PRIMER. Do a two square foot area. Water base will simply not work. Once sealed with the oil base primer any kind of finish coat can be used. If the oil base primer doesn't work you would probably be best off covering the walls with a quarter-inch thick layer of gyp board. Hope the primer does the job for you.