Manufacturers of solventbased wood protective paints and stains are witnessing increasing demand for protection against both fungi and algae in their formulated products. Troy Corporation has developed "Polyphase 963", a broad-spectrum fungicide and algaecide for use in solventborne systems. The product has performed well in long-term exposure testing on wood substrates in climates prone to severe fungal and algal growth. It is based on preservative technologies IPBC, BCM, and Diuron, and is a low-VOC product that is free of formaldehyde and APE.