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Waterproof Sealant Clay: Our Moldable Sealant Clay is a versatile solution for your repair needs. it can be used as a hole filler putty for walls, a duct seal putty and as a putty for wall holes High Plasticity: Sealant Mastic is highly malleable and you can twist it into any shape you want, such as round; square; or long, which makes it easy for you to adjust the shape according to the actual aperture size Fast Air Dry: New Type Waterproof Sealant Mastic expands and dries in minutes to effectively fill gaps Multipurpose: Duct Putty can meet your various maintenance needs. It can be used as wall hole filler putty, air conditioning pipe sealing putty, and sewer pipe filling Easy to Use: To use, just wipe away dust and debris around the gap with a towel. Then open the package, squeeze the mud sealer into the crack and smooth it out