5 Ways To Use Flex Caulk Around Your Home This Spring

This blog was written by a member of the Flex Seal Editorial Team.

Spring is the perfect time to make home repairs and seal up damage left by winter weather. And that’s where Flex Caulk comes in—a high-performance caulk designed for quick, effective repairs. With its Adjustable Trigger Flow Nozzle™, there’s no need for a caulking gun, making application smooth and easy for DIYers of all levels. Flex Caulk is available in a hybrid polymer formula and a 100% silicone formula. Read on to learn how Flex Caulk can help you with home maintenance this spring.

5 Ways to Use Flex Caulk Around the House

1. Seal Windows and Doors to Keep Drafts Out

Proper caulking around windows and doors helps keep cool air inside and warm air out, improving energy efficiency. Start by removing any old sealant and cleaning the surface for better adhesion. Remove the tab and Snap and Save cap on your Flex Caulk, hold the nozzle at a 45° angle, and apply a smooth bead. Use a gloved finger to smooth it out within 10 minutes. For best results, allow 12-24 hours for the caulk to fully cure.

2. Protect Against Spring Rain: Gutters & Foundation Cracks

Heavy rain can lead to leaks if your home isn’t properly sealed. Cracks around gutters and foundation walls allow water to seep in, potentially causing structural damage. Flex Caulk bonds to a variety of materials —including concrete, brick, and metal —creating a strong, waterproof seal that helps prevent costly water damage.

3. Outdoor Prep: Siding, Decks, and Fence Repair

Fluctuating spring temperatures can cause gaps in siding, decks, and fences. Flex Caulk’s flexibility ensures it moves with the natural expansion and contraction of materials, preventing cracks and maintaining a long-lasting seal. Use it to repair seams and joints, keeping your outdoor spaces in top shape.

4.Basement and Crawl Space Sealing

Moisture buildup in basements and crawl spaces can lead to mold, mildew, and pest infestations. Seal vents, pipes, and window gaps with Flex Caulk. Its strong adhesion and waterproof properties make it an ideal solution for creating a durable barrier against humidity and pests.

5.Bathroom & Kitchen Touch-Ups

This season isn’t just about decluttering—it's also a time to refresh caulking around sinks, tubs, and backsplashes. Flex Caulk features a waterproof, mildew-resistant formula, making it excellent for high-moisture areas like kitchens and bathrooms. Apply a fresh bead to keep these spaces looking clean and protected from leaks.

Flexpert Tip: Once fully cured, Flex Caulk Hybrid and Silicone formulas are 100% waterproof, however, only the Hybrid formula can be used on wet surfaces or underwater.

Application Tips

Prep First: Remove old sealant and clean surfaces before applying Flex Caulk
Act Fast: Smooth within 10 minutes of application for a clean finish
Store Properly: Use the Snap and Save cap to extend product life

From sealing windows to caulking bathroom fixtures, Flex Caulk makes spring home maintenance easy. Get yours today!