Whether you are refurbishing your existing stucco and repairing your chimney, it is important to select the right product so you only have to do the job once. ef Coat Foundation Coating is a revolutionary product that looks like stucco yet is flexible enough to be installed over concrete. Is your chimney leaking? Check the condition of your mortar joint and if it is degraded then we would recommend Mortar Match. Repairing stucco can be timely and often times not very effective. The 80/20 Stucco Re-Coat works great to repair or refresh existing stucco.