TEC 15030396 AccuColor 100 2.8 lb AccuColor 100 Silicone Sealant Ta-155 / 950 Jet Black is easy to use, flexible, and non-corrosive. It resists water and most common chemicals, offers permanent flexibility, won't crack, shrink or sag and provides excellent weatherability. Use for swimming pools, spas, fountains and other wet area applications. It allows both 25% joint compression and expansion.