I'm wondering what elastomeric paint is used for if it entraps water. I see it advertised for stucco like exteriors. The stucco job on my house is in fairly good shape, it's just an ugly gray color and very dirty looking. I am replacing a few windows and will need to patch around them, but don't need to re-do the whole house. How can I give it a do-it-yourself "paint job", maybe a new color, without breaking the bank? Thanks.