Sto Powerwall® NExT and Powerwall® Stucco vs. Conventional Stucco Choosing a stucco system can be difficult. It is important that the system provides superior protection against moisture intrusion, air leakage and cracking. Sto offers two stucco systems - Powerwall® NExT, which has air leakage & moisture intrusion protection, and Powerwall® Stucco. Both systems offer advantages over conventional stucco, which you will see on the chart below.