GacoPatch Silicone Roof Patch · Gray 2-Gallon GacoPatch is a flashing grade, standalone roof patch made with 100% silicone. The convenient wide top pail makes GacoPatch application easy to do with a trowel or a brush. GacoPatch is a one step application which eliminates the cost of additional products such as primers, seam tapes or top coats. New and improved technology allows for GacoPatch to be the long term solution for roof repairs. FEATURES ONE STEP APPLICATION. No primer required. GacoPatch is ideal for quick repair as a stand-alone product. UV STABLE.Resists degradation – will not chalk, crack or peel. FLASHING GRADE.Apply GacoPatch with a trowel on vertical or horizontal applications, even over ½” thick. FOR USE ON: Cracks, expansion joints, flashings, pitch pans, small holes, vents, and more.