Stucco can be applied over a variety of materials, ranging from wood to metal lathe to bricks and blocks. The properties of the material under the stucco can affect the performance of the stucco, which in turn affects the coating you apply. That's why it's important to know as much as possible about the structure you'll be coating. It may look innocuous and easy to paint, but don't let it fool you. One of the biggest problems you'll face with stucco is alkalinity.
New stucco has a hot surface.
The Portland Cement Institute and the Gypsum Plaster Association both recommend that cementitious products, including stucco, cure for 28 days before painting. If you work in humid climates, nature takes care of part of the hydration process. If the 28-day curing period has expired and the pH still is on the high side, politely recommend that the plastering contractor or owner spray down the building two or three times a day for a day or two. A garden hose with a nozzle and a fine spray mist is all that's needed. He should know when the stucco was applied and what system was used.