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Thread sealant is only relevant when a water-pump fastener actually enters a coolant or water jacket. It is not interchangeable with a threadlocker, a pump gasket or RTV; each solves a different problem. Confirm the engine service manual’s specified product, placement and torque first—those requirements override generic product advice. Use the exact product instructions for chemistry, cure time, temperature and fluid compatibility.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Permatex Thread Sealant with PTFE, 80631 | $6–$12 | Amazon · eBay |
| 2 | Permatex Thread Sealant with PTFE, 80632 | $12–$25 | Amazon · eBay |
| 3 | Permatex High Temperature Thread Sealant, 59214 | $6.99 | Amazon · eBay |
| 4 | Permatex High Temperature Thread Sealant, 59235 | $7–$15 | Amazon · eBay |
| 5 | Loctite 592 Thread Sealant | $8–$18 | Amazon · eBay |
| 6 | Loctite 565 Thread Sealant | $12–$25 | Amazon · eBay |
| 7 | Loctite 567 Thread Sealant | $15–$35 | Amazon · eBay |
| 8 | RectorSeal T Plus 2 Thread Sealant | $10–$20 | Amazon · eBay |
| 9 | Permatex 56521 High Performance Thread Sealant | $8–$18 | Amazon · eBay |
The picks, in detail
Permatex Thread Sealant with PTFE, 80631
A PTFE thread sealant for metal threaded fittings and specified wet-thread sealing jobs.
- PTFE formula
- -65°F to 300°F range
- metal-thread sealant
- Maker lists coolant-related applications
- 1 oz tube format
- Not a gasket maker
- Use only where manual calls for thread sealant
Permatex Thread Sealant with PTFE, 80632
The larger Permatex PTFE thread-sealant package for repeated service work.
- PTFE formula
- -65°F to 300°F range
- 4 oz bottle
- Larger quantity
- Same thread-sealant chemistry family
- More product than a one-off repair needs
- Not threadlocker
Permatex High Temperature Thread Sealant, 59214
A high-temperature threadlocker-sealant for selected threaded oil and coolant applications.
- high-temperature formula
- threadlocker-sealant
- 0.2 oz tube
- $6.99 observed price
- Retail listing names coolant-line compatibility
- Combines locking and sealing—do not substitute for a manual-specified sealant
- Small tube
Permatex High Temperature Thread Sealant, 59235
A Permatex high-temperature thread-sealant product commonly specified as an equivalent for certain coolant-exposed fasteners.
- high-temperature thread sealant
- automotive formula
- tube package
- Exact automotive product number
- Appropriate only when manual specifies this type
- Not a universal water-pump instruction
- Confirm cure and torque procedure
Loctite 592 Thread Sealant
A thread-sealant product used where the service manual specifies Loctite 592 or an equivalent.
- thread sealant
- automotive service use
- wet-thread application category
- Exact named manual-specified product in some applications
- Sealing role is distinct from a gasket
- Use only with the manual’s instructions
- Do not treat as generic threadlocker
Loctite 565 Thread Sealant
An anaerobic thread-sealant option for compatible metal pipe threads and fittings, subject to manual and material compatibility.
- anaerobic thread sealant
- metal-thread use
- Loctite product
- Purpose is sealing threaded joints
- Different product class from RTV
- Not automatically suitable for every bolt
- Check coolant compatibility and cure instructions
Loctite 567 Thread Sealant
A high-temperature thread sealant intended for compatible metal threaded connections.
- thread sealant
- high-temperature line
- metal-thread use
- Dedicated thread-sealant category
- Available in multiple package sizes
- May not be the manufacturer-required product
- Do not use on plastic unless instructions allow
RectorSeal T Plus 2 Thread Sealant
A pipe-thread sealant for compatible threaded connections, included as a sealant-category comparison rather than a gasket product.
- thread sealant
- pipe-thread product
- multi-use sealant
- Clearly a thread-sealant product
- Useful when manual specifies an appropriate equivalent
- Check automotive coolant compatibility first
- Not a pump-gasket substitute
Permatex 56521 High Performance Thread Sealant
A Permatex high-performance thread sealant for compatible threaded metal connections.
- high-performance formula
- thread sealant
- automotive service product
- Dedicated sealing chemistry
- Alternative package/product line
- Follow its data sheet—not generic advice
- Not intended to replace specified gasket sealant
Buying tips
- If the removed bolt does not enter coolant, do not add sealant just because it is a water-pump bolt.
- Do not substitute RTV, gasket dressing or blue threadlocker for a manual-specified thread sealant.
- Clean threads, use only the stated amount and follow the service manual’s torque and cure instructions.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.