I am looking for any suggestions or advice. When the interiors of buildings become exposed, wood that has not seen the elements from the great outdoors still have a tendency to gray. I am having a horrible time recreating this. Any suggestions would be greatly appreciated. In other words, HELP.

I have used Tamiyia's smoke to tint the color of wood. It works great giving wood a look that it has been exposed to the elements for a while. I guess you could cut it with mineral spirits and use light coats untill you got the effect you wanted.

Try a gray wash - tamiya dark gray - put a drop of it in some water/thinner and apply to the whole surface. Finish it off with a touch of pastels.

Micro-Mark makes a product that will age wood instantly. If you use real wood in your dios this will do the trick. It is located under the painting, decalling, and weather section. It is item #60863. http://www.micromark.com/