Is this product suitable for leaking cast iron joint of a drainage pipe?

As long as the joint isn't under pressure, (mains supply ) I have found it stops leaks in most cases , just clean off joint , apply product pushing into crevice or thread, it will then set to a jelly kind of substance when it comes into contact with water , good product for most applications so cant see why it wont work

Canthis be used to seal a leak that in a shower fitting that is spraying at high pressure when used?

Depends on the size of the hole but i would say yes. Sealed water pressure at 2 bar with this stuff.

Will this seal a leak in a campervan where the pipe has disconnected from the tap?

If the pipe has completely disconnected then this sealant will not help. If you are able to re-connect the pipe to the tap, a smear of the sealant on the connection before tightening it will help to stop a small leak (dripping). The sealant is very good for stopping drips and small leaks. It can't be used as a substitute for good plumbing.

How do you apply this stuff?

Just to correct the early reply, Fernox's own site states LS-X is suitable for both compression and screw fittings.

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Fernox 603022 Ls-X Leak Sealer External, 50 g

Fernox 603022 Ls-X Leak Sealer External, 50 g

Product ID: 49191272

Details

Brand
Fernox
Item weight
0.07 Kilograms
Material
Silicone
Style
Compact
Water resistance level
Water

💧WRAS approved for potable water

⚙️50g ready-to-use silicone paste

🌡️Works from -10°C to 100°C

Description

💧 Seal leaks like a pro—fast, flexible, and fail-safe!

TEMPERATURE TOUGH - Reliable performance from freezing cold to boiling hot water
NON HARDENING FORMULA - Joints stay flexible and easy to undo—no permanent locks
SAFE FOR DRINKING WATER - WRAS approved, ensuring 100% safety for potable water systems
VERSATILE COMPATIBILITY - Perfect for compression joints & screwed fittings on multiple materials
FAST ACTING LEAK SEALING - Stop leaks instantly with a proven silicone formula

Fernox 603022 LS-X Leak Sealer is a 50g ready-to-use silicone paste designed for external leak sealing on compression joints and screwed fittings. It operates effectively across a wide temperature range (-10°C to 100°C), never hardens to allow easy joint disassembly, and is WRAS approved for safe use with drinking water.

Specifications

ASIN	B0051TPIQ6
Best Sellers Rank	164,532 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,834 in Sealers 6,687 in Pumps & Plumbing Equipment
Brand	Fernox
Colour	Yellow
Compatible Material	Various materials
Customer Reviews	4.4 4.4 out of 5 stars (1,360)
Global Trade Identification Number	05014551584341, 05014551999961
Included Components	Sealer
Item Form	Paste
Item Type Name	LS-X LEAK SEALER EXTERNAL 50 GM
Item Weight	0.07 Kilograms
Manufacturer	Fernox
Manufacturer Part Number	LS-X
Material	Silicone
Model Number	LS-X
Number of Items	1
Number of Packs	1
Style Name	Compact
Supported Standards	WRAS
Surface Recommendation	Wall, Floor, Ceiling, Pipe
UPC	772040563226
Unit Count	1.0 gram
Water Resistance Level	Water Resistant

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