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I love the whitewash idea!
What are the proportions?
I'm very interested in this as well. I searched around a little and found many recipes for different effect and purpose. With extra additives ranging from rice to pigs blood, portland cement to milk etc. Whitewash is germicidal and it resists mildew well since it allows the wood to breath. Plus it doesn't contain any of those harmful VOCs that commercial paints do.
Respect the caustic nature of Hydrated Lime and use a dusk mask and wear rubber gloves when making your whitewash.
Here is the most basic recipe I found... (copied from Fias Co Farm
http://fiascofarm.com/recipes/whitewash.html)
Mix in a large bucket, a five gallon paint bucket is ideal:
3 large coffee cans of hydrated lime (about 12 cups)
1 pound or 1 small coffee can of salt (about 4 cups)
2 gallons of water
When you mix this together, mix a little lime/salt, then a little water, then a little lime, etc. It you just dump it all together it's like stirring boat anchor. You should let the mixture sit over night, but we usually just use it right away and have had no problems.
The white wash should be fairly watery, remember it's a wash, not a paint. Give it a stir once and a while as you use it.
To use the white wash, just get a big brush and slop it on. Don't worry about getting it on your clothes, it washes out very easily. It may seem like it's not covering very well as you paint it on, especially on new pine 2x4s, but it will whiten up considerably when it's completely dry, be patient.
In no time at all, you'll have a brighter and fresher environment for you and your goats.