Thanks for all the suggestions. I am not in a hurry to color the outside... will be busy for quite some time with the inside, so I have time to experiment.
I like the coffee idea, and I will look around for some iron sulfate. The local coffee shops give away used coffee grounds for use in gardens. I think I will boil some of this and see how it turns out.
I will probably whitewash in the meantime to even out the color. I imagine I can stain the whitewash later... will probably try mixing whitewash with the coffee beforehand to see how that works out as well.
I will let everyone know how it turns out.
--- In papercreters@yahoogroups.com, "Brandon Hoult" <bhoult@...> wrote:
>
> I found that if I sprayed water on the outside of my papercrete dome on a warm dry day that the temperature on the inside would drop substantially from evaporative cooling. I was planning on painting it at some point to seal it, but this may be too big an advantage to ignore.
>
> The problem is that I can find very little info on water permeable paints. There is a lot on vapor permeable paint, but that will not really help with this application as I want the water to soak in. I may just leave it unpainted, but it looks kind of grey and blotchy so it would be nice if I could even out the color at least. Also I want it to be a slightly dark color so that it blends in to the woods a bit.
>
> Things I am looking into are whitewash, milk paint, tempera and colored chalk powder. Any thoughts?
>
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