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Underwater Magic Mosaic is an extremely powerful, one component sealant designed for underwater use in pools and spas. Underwater Magic is suitable for a wide variety of indoor and outdoor tasks as well as for fixing leaks and making repairs underwater. Underwater Magic can be used underwater or in wet areas to fix tiles, replace tiles, as a joint sealer, and crack filler. This 100% silicone-free formula is odorless, UV resistant, and guaranteed to work. 4 ounce tubes of Underwater Magic Mosaic are used during smaller jobs like tile or grout repair and feature a hand squeezable design and resealable cap.