Henry 209XR Extreme rubberized Wet Patch roof leak repair is an ultra-premium, rubberized roof sealant with excellent adhesion, especially at moving joints where its flexibility and elasticity make it ideal to standard roof cements. Instantly stops leaks in severe weather conditions and is especially easy to spread in cold temperatures.Stops leaks instantly, even in standing water100% wet surface adhesion per ASTM D3409No blistering, sagging or sliding per ASTM D4586Permanently resists shrinkageProduct performance is not impacted by permanent UV exposure