Moldex Sealant is a simple to use, spray applied invisible film that protects against the harmful effects of moisture damage. Apply this mold treatment immediately after cleaning to establish a barrier between the surface and the bacteria, mold & mildew. When applied properly, this water-based product provides long-lasting resistance to stains and discoloration. Perfect for both indoor and outdoor applications. It is easy to apply mold prevention that dries clear and fast.