Is Flex Caulk 100% Silicone?
Flex Caulk is available in two formulas: Flex Caulk Hybrid and Flex Caulk Silicone. Each one is engineered for different project needs, giving you options based on your surface, conditions, and whether or not the caulk will be painted.
Flex Caulk Silicone
Flex Caulk Silicone is a 100% silicone formula that creates a strong, waterproof seal (once cured) that remains flexible over time. It’s excellent for kitchens, bathrooms, windows, exterior applications, and more.
Key Features:
- 100% waterproof (once cured)
- UV-resistant
- Won’t shrink or crack
- Permanently flexible
- Not paintable
- For use on dry surfaces only
Use On:
- Glass
- Tile
- Metal
- Porcelain
- Finished wood
- Plastics (select types)
Flexpert Tip: Flex Caulk Silicone should only be applied to clean, dry surfaces. Once cured, it is 100% waterproof.
Flex Caulk Hybrid
Flex Caulk Hybrid is not 100% silicone; it’s a high-performance polymer blend that offers excellent adhesion and versatility.
Key Features:
- Can be applied in wet or dry conditions and cures underwater
- Paintable once cured (with high-quality latex paints)
- Weather-resistant
- Shrink and crack-resistant
- Great for both indoor and outdoor use
Use On:
- Brick
- Concrete
- Wood
- Vinyl
- Metal
- PVC
- Painted or unfinished surfaces
Which Flex Caulk Should I Choose?
If you want a 100% silicone caulk, go with Flex Caulk Silicone. If you’re looking for a caulk that can be applied to wet surfaces and is paintable, go with Flex Caulk Hybrid.
With two specialized formulas designed to tackle a wide range of surfaces and conditions, Flex Caulk can help you tackle your DIY projects and repairs. Have more questions about Flex Caulk? Check out our Reference Guide for more info.
