Primer Plus is a natural sanitizer, for in interior and exterior surfaces. Free of toxic substances. The product has a great sanitizing power due to the high percentage of Calcium Hydroxide content and its high pH. Functionality of the product: The sanitizing properties start once the film dries. One week after the application, it must be coated with GrafClean Ag+ white or color, in order to maintain the sanitizing activity. Ideal for protect your home.