H.B. Fuller
FlexOfold Part Underwater Thread-Locker for FlexOfold Anode Install - Zinc, Al, Mg
FlexOfold Part Underwater Thread-Locker for FlexOfold Anode Install - Zinc, Al, Mg
SKU:VC3-21305
Model-specific Flexofold service hardware. Match the part number, blade count, and shaft or saildrive family before ordering; the checks below make the differences clear.
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- Ships in 1–5 business days
- 30-day returns
- Advice from real cruisers
Underwater thread lock prevents underwater fasteners from loosening due to shock and vibration!
This Threadmate locking compound is an underwater thread-locker that can be pre-applied to screws and fasteners that will be installed underwater. Great for use on any boat propeller anode installation in - Salt or fresh water.
Traditional liquid thread-lockers and Loctite compounds are anaerobic, cure hard, and can't be used underwater. But, going without a thread-locking compound can be an expensive mistake.
This special underwater thread-locker is a very quick-drying non-anaerobic gel, and can applied to threads beforehand (on dry land), then later installed underwater to secure your prop, zincs, and other underwater nuts and bolts. Works in saltwater and freshwater.
This locking fluid is made with a blend of resins, and remains semi-solid and flexible, even underwater, so it not only prevents loosening but also dampens vibrations between the fastener threads.
- Can also be used in place of traditional thread-lockers above the water!
- Also works on plastic nuts and bolts and Nylon fittings and fasteners
- Great for securing loose or worn eyeglass screws!
- Secures threads up to 1-1/2 " in diameter
- Good for thread-locking scores of fasteners - a little goes a long way!
- 0.16 oz. multi-us squeeze tube
NOTE: Actual product packaging may vary slightly from photo shown.
Fitment check before ordering
FlexOfold Part Underwater Thread-Locker for FlexOfold Anode Install - Zinc, Al, Mg is a model-specific propeller part. Match the part to the propeller already on the boat before ordering.
| Field | What to verify |
|---|---|
| Part family | Anode |
| Fitment clue from this page | Match zinc anode family. |
| Check on your propeller | Blade count, shaft or saildrive family, hub markings, current part number, and water type for anodes. |
| If unsure | Send photos of the propeller open and closed, the old part, and any markings before ordering. |
Parts FAQ
Are FlexOfold parts interchangeable across propeller families?
No. Many anodes, cover plates, service kits, shock absorbers, nuts, and washers depend on blade count, shaft/saildrive family, and part number.
Should I buy parts before haulout?
Yes, if the part number is known. For unknown parts, gather photos and markings before haulout so the right parts can be ready.
Browse related items in FlexOfold propeller parts and accessories.
Shipping & lead times
Shipping & lead times
We're a small team of boaters and we pack orders within 1–5 business days (no weekend or holiday packing). You'll get an email with tracking as soon as a label goes on your box.
Specialty items — fire extinguishers (dangerous goods) and low-stock or built-to-order gear — can take longer; the product description will say so. On a tight timeline or meeting your boat somewhere specific? Contact us and we’ll work out the fastest way to get gear to you.
International orders ship DDU: local duties, taxes, and customs fees are the buyer’s responsibility. Full details in our shipping policy.
Returns & refunds
Returns & refunds
30-day returns from the date of purchase. Items must be unused, in the original packaging with all cables and accessories, with proof of purchase.
Contact us before shipping anything back — we’ll send the return form that must accompany your return. Fire extinguisher and lithium battery items carry a $15 administrative fee on returns.
Read the full refund policy.
Ask a cruiser before you buy
Ask a cruiser before you buy
Everyone here is a current or past cruiser — we’ve docked short-handed, re-rigged at anchor, and chased 12V gremlins too. Not sure this is the right fit for your boat? Send us your question before you order and we’ll give you a straight answer.
Check the exact part match
- Part number: compare the listing and the marking on the existing component whenever one is available.
- Propeller family: confirm blade count and whether the propeller is a shaft, saildrive, or composite model.
- Size and generation: check the hub, bolt, cover, blade, or anode dimensions and any model-year notes below.
- Service scope: verify what is included in the kit and retain the installation instructions for torque and assembly order.
Product specifications and details
Underwater thread lock prevents underwater fasteners from loosening due to shock and vibration!
This Threadmate locking compound is an underwater thread-locker that can be pre-applied to screws and fasteners that will be installed underwater. Great for use on any boat propeller anode installation in - Salt or fresh water.
Traditional liquid thread-lockers and Loctite compounds are anaerobic, cure hard, and can't be used underwater. But, going without a thread-locking compound can be an expensive mistake.
This special underwater thread-locker is a very quick-drying non-anaerobic gel, and can applied to threads beforehand (on dry land), then later installed underwater to secure your prop, zincs, and other underwater nuts and bolts. Works in saltwater and freshwater.
This locking fluid is made with a blend of resins, and remains semi-solid and flexible, even underwater, so it not only prevents loosening but also dampens vibrations between the fastener threads.
- Can also be used in place of traditional thread-lockers above the water!
- Also works on plastic nuts and bolts and Nylon fittings and fasteners
- Great for securing loose or worn eyeglass screws!
- Secures threads up to 1-1/2 " in diameter
- Good for thread-locking scores of fasteners - a little goes a long way!
- 0.16 oz. multi-us squeeze tube
NOTE: Actual product packaging may vary slightly from photo shown.