Beach, desert, whatever, it should never be used on a stucco/block home. If you apply a non-breathable coating over the top of stucco, moisture won't be able to evaporate. Elastomeric paint can be used to fill in stucco cracks that are 1/16 of an inch or so, but the better choice is elastomeric caulk to remedy the cracks, especially for cracks wider than 1/16 of an inch. The caulk has great elasticity, so it will move with cracks if they widen, and it will help prevent water from seeping through the cracks. Painting an entire wall with elastomeric paint, on the other hand, could make your problem worse. Elastomeric paint is so watertight that it prevents the walls from "breathing." So if water does manage to find its way into or behind your walls, it will get trapped there. That can cause problems like bubbling paint and mold growth. Ask any top painting contractor in Phoenix or Tucson and they will tell you that. I've dealt with both good and bad salesman in paint stores. Some know their stuff, the others were probably selling used cars the week before.
