Flex Caulk is an easy-to-use sealing solution from the Flex Seal Family of Products. This high-performance caulk doesn’t require a caulking gun and is available in a Hybrid Polymer or 100% Silicone formula. Flex Caulk allows you to control the flow of caulk, making it suitable for many DIY home projects and repairs.

Let’s explore some ways you can use Flex Caulk around your home, inside and out.

1. Bathroom and Kitchen Projects

Flex Caulk is ideal for moisture-prone areas around your home to keep water out and prevent mildew. Its flexible formula allows it to move with your surfaces without cracking or shrinking over time.

Common uses include:

• Sealing gaps around bathtubs and showers
• Closing seams between kitchen counters and walls
• Caulking around sinks and plumbing fixtures

Flexpert Tip: Only Flex Caulk Hybrid will adhere to wet surfaces or work underwater.

2. Windows, Doors, and Trim

Drafts and leaks around entry points can drive up energy bills and cause issues over time. Flex Caulk can seal those vulnerable areas, providing a weathertight barrier that holds strong.

Use it for:

• Sealing around window frames and sills
• Filling in spaces around door jambs and thresholds
• Caulking decorative trim and molding to eliminate shadows and cracks

3. Interior Wall Repairs

Flex Caulk works great for cosmetic fixes that require a smooth finish. From hairline cracks to baseboard gaps, this powerful sealant can help repair the damage. Once dry, it can be painted (Hybrid formula only) to match your walls, trim, or ceiling.

4. Outdoor Applications

Flex Caulk is great for outdoor fixes thanks to its weatherproof abilities. It’s UV resistant and bonds to many materials, including wood, aluminum, brick, concrete, and more.

Try it for:

• Sealing exterior siding joints
• Filling gaps in brick or masonry
• Preventing water intrusion around outdoor light fixtures

5. Around HVAC and Utility Openings

Use Flex Caulk to seal around HVAC ducts, utility penetrations, or pipe openings to help keep out pests, water, and dust. Its flexibility makes it a long-lasting solution for areas subject to vibration or thermal expansion.

Whether you're a DIY enthusiast or a seasoned pro, Flex Caulk is a reliable choice for sealing, finishing, and protecting virtually any surface in your home.

Want to learn more about what Flex Caulk can do? Click here.