Flex Seal Flex Caulk 100% Silicone Waterproof Sealant, White 6.5 oz — No-Gun Cartridge, UV-Resistant

Flex Caulk is a ready-to-use, 100% silicone waterproof sealant in a 6.5 oz cartridge that creates a flexible, long-lasting watertight bond without a caulk gun.

Designed for indoor and outdoor sealing jobs, this white Flex Seal Flex Caulk provides a fast, easy way to repair gaps, joints, and seams around sinks, windows, doors, and exterior trim. The cartridge fits common caulk applicators or can be squeezed by hand in many situations thanks to its adjustable trigger flow nozzle and snap-close cap. Built to resist UV, moisture, and common chemicals, it stays flexible over time to prevent cracking and separation.

How does this sealant make small repairs simpler?

You can apply this silicone directly from the cartridge for many tasks without a full caulk gun, saving time and cleanup. Its adjustable trigger flow nozzle controls bead size so you get neat lines and less waste.

• No separate caulk gun required for many users — squeeze or use a standard applicator
• Trigger flow nozzle adjusts bead width for precise work
• Snap & Save cap seals between uses to prevent hardening

Will it hold up against water and weather over time?

The formula is 100% silicone, engineered to remain waterproof and weatherproof while resisting UV exposure and common chemicals. It remains flexible so it won’t easily shrink, crack, or turn brittle in changing temperatures.

• Creates a watertight barrier against rain, splashes, and condensation
• UV-resistant for outdoor use without yellowing or breakdown
• Maintains elasticity to accommodate movement in joints and seams

Where is this product best used around the home or job site?

Flexible and durable, this silicone works well on bathroom fixtures, kitchen sinks, windows, doors, gutters, and exterior trim. It bonds to many common surfaces and is especially useful where a long-lasting, waterproof seal is needed.

• Bathroom tubs, showers, and sinks to protect against moisture leaks
• Window and door perimeters to reduce drafts and water intrusion
• Exterior joints, trim, and flashing for weatherproofing

How do I apply and maintain the seal for best results?

Surface prep is straightforward: clean, dry, and remove old sealant or debris before applying. After placing a consistent bead, tool or smooth the joint within a few minutes, and close the snap cap for storage between uses.

• Clean and dry surfaces; remove loose material before application
• Cut nozzle to desired bead size, apply evenly, then tool within minutes
• Reseal with Snap & Save cap to preserve unused product

Who is this for: Homeowners, renters, DIYers, and professionals who need a dependable, easy-to-use silicone sealant for everyday waterproofing and weatherproofing tasks. If you want a flexible, long-lasting white seal that resists UV and moisture and doesn’t always require a separate caulk gun, this 6.5 oz Flex Caulk cartridge offers a convenient solution for routine repairs and preventive maintenance.