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While caulk is long-lasting on solid, unmoving surfaces, silicone sealant’s flexibility means it lasts longer in areas with higher moisture. Using silicone sealant in a bathroom for sealing cracks in the tub and shower will create a more durable seal without needing to frequently re-apply.
Silicone caulk is best suited for porous surfaces such as wood and ceramic, while silicone sealant works well on non-porous surfaces such as metal and glass. Conclusion. Silicone caulk and sealant are two popular adhesives that have different properties and uses.
Silicone is a waterproof sealant that offers more flexibility than decorators/painters' caulk which makes it an ideal choice for sealing a bath and similar areas such as showers where movement is more prominent.
100%-silicone sealant to consider: Oatey® Silicone Sealant is a mildew-resistant silicone sealant that can be used on ceramic tiles, tubs, showers, rimless sinks, and plumbing fixtures. This high-performing sealant is resistant to weathering, ozone, UV radiation and thaw/freeze conditions.
Silicone sealant, on the other hand, is more flexible and waterproof, making it ideal for sealing sinks, bathtubs, showers, and other high moisture areas. The Spruce recommends silicone sealant for sinks, toilets, faucets, and tiles in rooms that tend to get wet.
The main difference between caulk and sealant is that sealant has higher elasticity, while caulk is less flexible. More elasticity means that sealant can expand to form a tighter seal, making it a great choice for high-moisture areas like tubs, showers, and plumbing.
When comparing caulk and silicone, 100% silicone is the best choice for sealing things in bathrooms, kitchens, and other rooms that are exposed to a lot of moisture on a day-to-day basis. Silicone is a water-resistant material, meaning it will not shrink or change in response to water.