Succulents do not need more moisture than their regular watering requirement.  Misting leads to root rot and damage to the plant entirely due to overwhelming moisture.  Aloe Veras should not be misted at all.  However, if the leaves are dirty or dusty, spray a small amount of water and use a clean cloth to wipe down the surface.  Even this should only be done twice in a year or so, and avoid doing it during winters.