Storm System Category 3 Hi-Build Finish contains an extremely hard-working Semi-Solid Formula. These impressive finishes combine a beautiful semi-solid stained look with long-lasting durability. Reinforced for maximum durability, these finishes are perfect for log siding, wood screening, fencing, and outdoor furniture. This product decorates and protects exterior wood siding from weather and temperature changes. This product can be used on new wood and previously stained wood with proper preparation. Apply one coat over previously stained surfaces but two coats will provide maximum protection on new or unfinished wood.