I had a scrap piece of Hardi Board that I wanted to experiment on. I took six differnt cans of Minwax wood stain that I have on my shelf and put it on the Hardi Board. I put on one coat and then a stip of green paint. The green matches my metal roof and should give me an idea of how it will look with trim paint and a metal roof.
It's only one coat, so I expect some fading. The next time I have to stain something, I'll put a second coat on half of it to compare the difference.
It's been sitting outside on the roof of a parts car that I'm playing around with. It's been exposed to the elements for a month now with no noticible change. I've got a year or two until I build my cabin, so there is plenty of time to see how this works out.
Thanks for the idea, I love the way your home turned out and I'm exited about the possiblities of using Hardi Boards that will look like real wood.