Waterproof Sealant Mastic, 1-Pack

This waterproof sealant mastic is a moldable clay-style repair filler designed to close small holes, cracks, pipe openings, wall gaps, air-conditioning holes, and similar voids around the home or workshop. It can be shaped to the opening, pressed into place, and blended with the surrounding surface for a cleaner finish.

• Moldable sealant for filling cracks, wall holes, pipe gaps, air-conditioning openings, and other small voids.
• Designed for use on common areas such as walls, foundations, basements, sheds, roofs, metal, wood, and concrete surfaces where suitable.
• White finish can blend with many light-colored surfaces and may be painted over after curing when the surface is properly prepared.
• Supplier-described as waterproof and flame-retardant for added protection in repair applications.
• Air-dries quickly, with the source description noting drying in about 10 minutes depending on application conditions.
• Available in multiple pack quantities so you can choose a single piece for small repairs or a multi-pack for several gaps.

Choose BUY 1 for a single small repair. Select the 3-piece or 5-piece packs if you need to seal several gaps around pipes, walls, or air-conditioning openings. Choose the 10-piece value pack for larger projects, multiple rooms, or keeping extra sealant on hand for future repairs.

Shape the mastic to match the size of the hole or gap, then press it firmly into the opening and smooth the surface. Allow it to air-dry before painting or exposing the area to regular use. For heated pipes, high-temperature areas, or surfaces exposed to constant water pressure, confirm the application requirements before use.