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 Thread Sealant for Plumbing Pipes and Fittings, Reliable Fast Action Pipe Sealant for Metal and Plastic, 50m

LOCTITE 55 Pipe Thread Sealant, Non Curing Thread Sealant for Plumbing Pipes and Fittings, Reliable Fast Action Pipe Sealant for Metal and Plastic, 50m

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 it fast, seal it right—because your pipes deserve the best!

ADJUSTABLE REUSABLE - Tighten and realign threaded connections up to 45° post-installation without compromising the seal—flexibility meets reliability.
EFFORTLESS APPLICATION - Compact container with built-in cutting tool lets you apply the perfect length every time—no mess, no fuss.
VERSATILE COMPATIBILITY - Engineered for both metal and plastic pipes, certified safe for gas and drinking water systems—one solution for all your plumbing needs.
HEAT RESISTANT DURABILITY - Withstands temperatures up to 130°C, ensuring reliable performance even in demanding environments.
SEAL IN SECONDS NOT HOURS - Experience immediate pressure-tight seals with zero drying time—get the job done faster and smarter.

LOCTITE 55 is a premium non-curing pipe thread sealant cord designed for quick, reliable sealing of metal and plastic pipe threads. Certified for gas and potable water use, it offers immediate pressure resistance without drying time, withstands temperatures up to 130°C, and features an integrated cutter for easy application. Ideal for professionals seeking durable, versatile, and efficient plumbing solutions.

Specifications

ASIN	B0083TWKIK
Best Sellers Rank	4,200 in DIY & Tools ( See Top 100 in DIY & Tools ) 90 in Sealers
Brand	Loctite
Colour	White
Compatible Material	Metal
Country Of Origin	Germany
Customer Reviews	4.6 4.6 out of 5 stars (1,884)
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
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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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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