Is there an unwritten standard that says I should use flat paint for repainting the wood siding on my house? I am looking at using a satin sheen because I know with interior paint satin seems to come clean a whole lot easier than flat paint does. Seond, I think I am going to buy Sears, Weather Beater, 20 year paint. Is this a good product to use? I do not want to have to repaint again 4-5 years from now. Any advice is appreciated. Thanks, Mike