What Temperature Can You Use Flex Caulk?
When planning an outdoor repair or installation project, temperature matters. Flex Caulk Hybrid and Flex Caulk Silicone are designed to be used in a wide range of temperatures and conditions to help you repair just about anywhere. Here’s what you need to know about temperature ranges and how to choose the right Flex Caulk for your project.
Flex Caulk Recommended Temperatures
Hybrid Formula: Best applied to surface temperatures from 0°F to 150°F. Once fully cured, it can withstand temperatures from -75°F up to 220°F.
Silicone Formula: Best applied to surface temperatures from -35°F to 150°F. Once fully cured, it can withstand temperatures from -70°F up to 400°F.
Flexpert Tip: Flex Caulk fully cures in 12–24 hours, depending on temperature, humidity, and the depth of the joint. Avoid water exposure until it's cured and allow extra time in cooler conditions.
Storage Temperature
To maintain the right consistency, store Flex Caulk in a cool, dry place. Do not store above 120°F. If the caulk gets too cold (near freezing), allow it to return to room temperature before using.
Why Temperature Matters
- Cold weather can cause caulk to thicken, making it harder to apply smoothly.
- Hot conditions may cause the product to skin over too quickly, making tooling difficult.
Which Flex Caulk Formula Should You Choose?
Both formulas are built for performance, but they behave slightly differently depending on the surface and conditions:
Hybrid
- Adheres to wet and dry, porous and non-porous surfaces; will even cure underwater.
- Low-odor, making it ideal for indoor applications in tight or enclosed spaces.
- Fully paintable (use a high-quality latex paint).
Silicone
- Works best on dry, smooth, non-porous surfaces.
- Highly odorous; use in a well-ventilated area.
- NSF (51) approved for use on equipment with food-contact applications (not for drinking water contact).
Built to perform across a wide range of temperatures, surfaces, and environments, Flex Caulk makes it easy to tackle everything from routine repairs to seasonal sealing projects. Check out our FAQs to learn more!
