Mexican Cal is used to cure a comal. You can see the process in the video to the right. To season or cure a comal, it over low heat and slowly bring it up to temperature. Prepare a watery mixture of Mexican Cal and water and spread a thin layer of the mixture over the entire surface of the comal using a dry towel or brush. Heat it until the lime mixture dries and hardens. Once cool, rinse the comal, and repeat the process. The comal is now ready for use.