GE Silicone I Kitchen & Bath – Permanently Waterproof – Caulk that keeps water out is a necessity in kitchen, bathroom, and plumbing applications. GE Silicone I* Kitchen & Bath caulk is permanently waterproof and it will not shrink, crack, or crumble over time like acrylic. Silicone chemically cures while acrylic is water-based (it simply dries as water escapes). Some acrylics can shrink up to 25 percent, leaving gaps and cracks for water to seep through. Those leaks can lead to water damage and mold growth. Why 100 percent silicone? Unlike acrylic, silicone is permanently: Waterproof—Acrylic breaks down in water over time. Flexible—Acrylic becomes less flexible and can even freeze at low temperatures, making it more likely to crack. Shrink-proof—Acrylic shrinks as the caulk dries. This shrinking can cause cracks over time. Crack-proof—Acrylic hardens, cracks, and crumbles over time when exposed to extreme heat and the sun’s UV rays. Made in USA.