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Waterproof Sealant Mastic:New Type Waterproof Sealant Mastic is made of an environmentally-friendly engineering material that is waterproof and corrosion resistant. it has a high density and can effectively prevent animals from destroying. High Plasticity:Waterproof Sealant Mastic is very malleable and you can twist it into any shape you want, such as round, square, long. It is very simple and convenient to use. Fast air dry: Contains a cooling adhesive component that automatically hardens in the presence of wind, making it very easy to handle. Simply fill the gap with the new waterproofing sealant and the seal will harden in a few minutes.Multipurpose: Our Quick Mending Mud is a versatile solution for your repair needs. It can be used as a hole filler putty for walls, a duct seal putty, a waterproof insulating sealant, and as a putty for wall holes. How to Use: First, wipe the dust and debris around the gap with a towel. Then open the package, squeeze the Mud Seal into the crack and smooth it out.