Flex Caulk: The New Waterproof Caulk From Flex Seal

“Flex Caulk: The New Waterproof Caulk From Flex Seal” was written by a member of the Flex Seal Editorial Team. All photos by Flex Seal Studios

If you’ve ever used traditional caulk in a caulking gun, you know how complicated and messy the application process can be. All that gripping, dripping and drying out is enough to stop any DIY project in its tracks. The good news? Now there’s Flex Caulk, the easy way to caulk everything from baseboards to bathtubs, without a caulking gun!

Flex Caulk is our latest innovation in caulking technology. It’s a high-performance, hybrid polymer caulk that is delivered through our “Adjustable Trigger Flow Nozzle™, which eliminates the need for a caulking gun and allows you to control the flow of the product.

“Caulking guns can be difficult to use and really haven’t changed much at all since their invention over 130 years ago,” said Phil Swift, CEO, Inventor, and Spokesman for the Flex Seal Family of Products. “We’re proud to introduce Flex Caulk as a modern-day solution to simplify caulking.”

Benefits of Flex Caulk

Flex Caulk is easy to use. Just adjust the flow setting and push the trigger for a perfect bead every time. And when you stop, it stops. There's no running, no dripping and no mess. When traditional caulks dry out, they end up getting thrown out, but Flex Caulk’s “Snap & Save” cap helps prevent the caulk from drying out, so you can use it again and again.

Flex Caulk’s optimized design allows you to apply product with the push of a finger. This versatile caulk bonds to all types of surfaces, including wood, glass, tile, metal, and more. And of course, it even works underwater!

Additional Features:

  • 100% waterproof caulk
  • Expands and contracts, staying completely flexible
  • Won’t shrink or crack and lasts for years
  • Lightweight and portable
  • Indoor and outdoor use
  • UV, chemical and mildew resistant
  • Solvent-free and virtually odorless
  • Dries to a paintable finish
  • Available in white or clear caulk

Where Can I Use Flex Caulk?

Flex Caulk is the easy way to seal areas inside and outside of your home. Some popular applications include:

  • Sinks
  • Toilets
  • Tubs
  • Showers
  • Baseboards and molding
  • Door frames
  • Outdoor fixtures
  • Filling gaps and holes
  • And more

Forget those ordinary caulks and ditch your caulking gun. It’s time to get Flex Caulk.


By Paula Falcon

Paula is an Editor for the Flex Seal Family of Products where she focuses on writing and editing articles for the company’s blog.

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