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Howdy from Tucson,
I'm not sure what your weather is like, but I can tell you from
experience that your painting will fade if it is in the sun. It will crack
if it is exposed to exterme temps. It will peal if it not flexible and
dries hard or expands at a different rate than the rock. Painters have
been dealing with this for ions. Probably the most durable exterior house
paint is the best to use. The vehicle of the paint is flexible enough to
withstand the weather, but the concerns of housepaint will probably be
along the lines of fading. Artists acrylic paint dries much harder than
oil based paints, and could peel. Probably the best bet is to paint a rock
on canvass, paint "welcome" on that rock, then hang it on the subject rock
only on overcast days when it is 72 degrees.
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