Can this be used as spindle packing for a leaky valve stem

I don't think you would have much success packing a valve stem, it's not designed for this purpose. Valve stem packing needs to retain pressure on the stem and this is why hemp, graphite (for high temperature applications) and PTFE reinforced with glass fibre are all used. Some valve stem seals are a fibrous type of compressible washer. If you use this Loctite product in this way it will leak.

Does this stuff have an expiry date?

I would say not as it seems to me to be PTFE tape except in thread or rope form and PTFE doesnt have any expiry date as far as I know. I bought this along with a high temp gasket maker and the gasket maker seems to be far better.

How do you apply it to a tap or other connector ?

You just wrap it around the threaded part in a zig zag motion so it crosses all the threads ...about 7 times..don't just follow the threads ..it won't work that way ...look on YouTube for the best explanation...it is great stuff .I use it rather than PTFE tape ,it's much better and stops leaks even if you have to turn the tap back a quarter turn to set it vertical ...was the best plumbing tape I,ve bought ...never bother with PTFE tape anymore .I,ve used it on dripping garden taps ,and it works first time

Would this work as a gasket seal on a water heater? It's all I can find that's water safe and up to the temperature.

It’s only for use as a thread sealant. Not really recommended for use as a gasket material. If you mean a gasket in the traditional sense ie between 2 flat surfaces the. High temperature materials are available or even ‘liquid’ gasket such as Hermotite. Be very careful for using on a water heater if high temperature and pressures are involved. If you don’t feel confident or competent please consult a professional.

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LOCTITE 55 Pipe Thread Sealant, Non-Curing Cord, White, 1x50m

LOCTITE 55 Pipe Thread Sealant, Non-Curing Cord, White, 1x50m

Product ID: 49905812

Details

Brand
Loctite
Item dimensions L x W x H
9.8 x 5.4 x
Item weight
0.05 Kilograms
Material
Polyamide
Style
Compact

🔥High temp resistance up to 130°C

⏱️Instant sealing, no wait time

🛠️Integrated cutter for fast application

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Description

🛠️ Seal smarter, not harder—fast, reliable, and ready when you are!

SEAL IN SECONDS - Immediate pressure-tight seal with zero drying time—get the job done faster.
CERTIFIED SAFETY - DVGW/KTW approved and WRAS listed for safe use in potable water systems—trust where it counts.
EFFORTLESS APPLICATION - Handy container with built-in cutter ensures quick, mess-free use every time.
VERSATILE COMPATIBILITY - Works flawlessly on both metal and plastic threads, approved for gas & drinking water systems.
HEAT RESISTANT RELIABILITY - Maintains integrity under extreme conditions up to 130°C—built for demanding environments.

LOCTITE 55 is a high-performance, non-curing pipe thread sealant cord designed for instant, pressure-tight seals on metal and plastic pipes. With approvals for gas and drinking water systems, it withstands temperatures up to 130°C and features an integrated cutter for quick, precise application. Trusted by professionals, it delivers certified safety and durability in a compact, easy-to-use format.

Specifications

ASIN	B0083TWKIK
Best Sellers Rank	2,644 in DIY & Tools ( See Top 100 in DIY & Tools ) 70 in Sealers
Brand	Loctite
Colour	White
Compatible Material	Metal
Country Of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (1,918)
Global Trade Identification Number	05010266373720
Included Components	1
Item Dimensions	9.8 x 5.4 x 16.5 centimetres
Item Form	Cord
Item Type Name	Loctite 483283 55 Pipe Sealing Cord for Gas/Water/Pneumatics, 50m Length
Item Weight	0.05 Kilograms
Manufacturer	Henkel
Manufacturer Part Number	483283
Material	Polyamide
Model Number	483283
Number of Items	1
Number of Packs	1
Style Name	Compact
Supported Standards	DVGW, KTW
Surface Recommendation	Metal, Plastic
Unit Count	50.0 millilitre
Water Resistance Level	Water Resistant

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SAR 60

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KSA.

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