Algae, mildew, and mold are all serious issues that many log home owners face. M-1 Advanced Mildew Treatment is designed to stop these nuisances in their tracks. With a broad-spectrum fungicide (IPBC or 3-iodo-2-propynyl butyl carbamate) leading the charge, M-1 Advanced Mildew Treatment is a mighty force. Even with all the cleaning power behind M-1, it will not alter your stains color. M-1 Advanced Mildew Treatment is able to be used in either oil or water-based coatings.