I have a quick paint question. I have a water tower that I'm working on for the top of a factory. I painted the roof a light aircraft grey and weathered it. While the weathering came out perfect (unfortunately), the base color looks wrong. It looks too flat and the overall effect makes it look like weathered plastic....not metal. So can any one suggest what paint or paint mix to use for old metal? Maybe I can do a search on here.....someone might have asked this before.