![](https://cdn.shopify.com/s/files/1/0282/4414/8333/files/advanced_use2.png?v=1762372723")
![](https://cdn.shopify.com/s/files/1/0282/4414/8333/files/heavy_duty_use2.png?v=1762372722")
Power Delivers instant grab
and a permanent, structural-strength hold
Any Condition Applies to wet, dry, or even underwater surfaces with ease
Resistant Withstands extreme weather, heat, and heavy
impact once cured
Adhesion Adheres to metal, wood, concrete, tile, plastic, and more
- $9.99
- $9.99
- Unit price
- per
FLEX SEAL®CONSTRUCTION ADHESIVE
POWERFUL PERFORMANCE FOR EVERY PROJECT.
Flex Seal Construction Adhesive delivers professional bonding power across every job type—from everyday fixes to structural builds. Available in three performance levels, each formula provides exceptional strength, durability, and versatility, engineered to handle the toughest indoor and outdoor conditions.
Hybrid adhesive performance for everyday jobs.
Flex Seal Heavy Duty Construction Adhesive delivers hybrid adhesive performance for everyday jobs—outperforming traditional latex adhesives in both strength and durability. Perfect for home repairs and small construction projects, it’s paintable, easy to apply, and withstands extreme conditions indoors and outdoors.
- Strong & Durable
- Fast Grab Formula
- Paintable & Easy to Apply
- Weather-Resistant Bond
Usage Instructions:
- Ensure surfaces are clean, dry, and free of debris.
- Cut nozzle to desired bead size.
- Apply adhesive in a continuous bead to one side of surface.
- Press materials together firmly.
- Remove excess adhesive with a damp cloth before it cures.
WARNING: California Proposition 65 Notice.
Professional-grade bonding for demanding conditions.
Flex Seal Advanced Construction Adhesive is engineered for professional-grade performance. This high-strength hybrid formula bonds to a wide variety of materials—even in wet or extreme conditions—making it the go-to choice for contractors and advanced DIYers. It fills gaps, holds heavy materials, and is formulated to last.
- Super Strong, Flexible & Durable
- Won’t Shrink or Crack
- Bonds Wet or Dry Surfaces
- Works Underwater
- Paintable
- Works Indoors & Outdoors
- Withstands Extreme Weather
- Instant Grab Formula
- Freeze & Thaw Resistant
- Fills Gaps
Usage Instructions:
- Ensure surfaces are clean and free of debris.
- Cut nozzle to desired bead size.
- Apply a continuous bead to one side of surface.
- Press surfaces together firmly.
- For overhead or heavy applications, provide support until fully cured.
- Clean uncured adhesive with mineral spirits or solvent; cured adhesive must be cut or scraped.
WARNING: California Proposition 65 Notice.
Maximum bonding strength and extreme durability.
Flex Seal Extreme Construction Adhesive is our most powerful formula—built for structural jobs and demanding environments. It features maximum bonding strength, instant grab formulation, and all-weather durability. Flexible and paintable, it withstands extreme weather conditions and even works underwater—the best choice for heavy-duty projects where failure is not an option.
- Structural-Grade Bond Strength
- Vertical & Overhead Hold
- Won’t Shrink or Crack
- Withstands Extreme Weather
- Works Underwater
- Bonds Wet or Dry Surfaces
- Indoor & Outdoor Use
- Flexible & Paintable
- Fills Gaps
- Freeze & Thaw Resistant
- Maximum Strength & Durability
- Instant Grab Formula
Usage Instructions:
- Ensure surfaces are clean and ready for bonding.
- Cut nozzle to desired bead size.
- Apply a strong, even bead to one side of surface.
- Position materials immediately and press firmly together.
- For structural applications, follow building codes and guidelines.
- Allow 24–48 hours to fully cure, depending on temperature and humidity.
- Remove uncured adhesive with solvent; cured adhesive must be mechanically removed.
WARNING: California Proposition 65 Notice.
