Quote:
Originally Posted by melissa17s 
Acrylic is not as toxic for the painter as oils [...]
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This is true usually, but water-based oils are safer in my opinion than acrylic because acrylics contain chemical solvents and plastic of course.
Winsor&Newton makes a line of water oils. They cure the same way as traditional oils because the water evaporates and only the pigment and linseed oil are left. I have never tried them outdoors, but I don't see how they would perform any differently than traditional oils once the water has evaporated. They are made with an altered form of linseed that temporarily accepts water; otherwise, they are just as great to work with, just as bright, pigment heavy, smooth, consistent and fine quality as their other artist paint lines. AND the greatest bonus is that they clean up with water- no turps or other solvents and they smell like linseed (which I enjoy).
I would also look into egg tempura for murals, myself (pp's suggestions are all good ones, I think). If you have any traditional orthodox churches near you, they often have tempura icons on the outside. The brightness and luminous quality of egg tempura are unexcelled in my opinion and egg tempura stands up well to the climate even in the southern parts of Canada, and even in the humid regions.
And I'm with you on the 'evil plastic' thing

and I hate hate hate working with acrylics- the smell, the texture, the dullness of its plastic-y look afterward. The aesthetic of the process is so important to me- just much as the final result. I hope nobody's offended; I just prefer my materials to look and feel 'real.'