MCXS® External Leak Sealer and Jointing Compound
The NEW external leak sealer and jointing compound is your next best friend. Designed to help you stop leaking joints quickly and easily, MCXS provides the perfect seal without setting hard, so undoing joints later isn't a problem.
Installer benefits
- Perfect for sealing low-pressure leaks and weeping joints
- Easy to apply and clean up
- Suitable for compression and screw fittings
- Ideal for wet or dry surfaces
- Easy to remove when required
- Safe to use with drinking water
- WRAS approved product

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Technical specifications
Physical and chemical properties
- Appearance: Sealant
- Colour: Milky white
- Odour: Mild, Acidic
- One-year guarantee
- Ready-to-use compound
- Cures in two hours
- Resealable tube
- WRAS approved
- Suitable for use with hot or cold water
Dosage instructions
Maintain peak performance
1. Ensure water pressure has been relieved prior to application and during setting. Drain system if necessary
2. Clean and prepare surface before use for good adhesion
3. Carefully apply MCXS from the tube
4. Once applied the sealant can be moulded
5. For sealing burst pipes, Incorrect datasheet
6. Replace cap immediately after use
7. Allow a minimum of 2 hours and up to 12 hours for MCXS to set. Curing time dependent on amount applied, and can be accelerated by spraying with water
MC-XS may be used as a jointing compound on hot and cold water services, including potable water, in place of traditional materials. Reinforcement is generally not required, but reinforcement fibre may be used on larger pipe sizes. The use of reinforcement material is advisable for larger leaks and higher pressures.
MCXS can be used with a binding bandage to aid repair
Sample text. Click to select the text box. Click again or double click to start editing the text.

Homeowner benefits
- 1-year guarantee
- Ready to use compound
- Cures in 2 hours
- Resealable tube
- WRAS approved
- Suitable for use with hot or cold water

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MCXS®
External Leak Sealer and Jointing Compound
High performance, fast acting silicone paste for use as a leak sealant and jointing compound is your next best friend. Designed to help you stop leaking joints quickly and easily, MCXS provides the perfect seal without setting hard, so undoing joints later isn't a problem.
Installer Benefits
- Perfect for sealing low pressure leaks & weeping joints
- Easy to apply & clean up
- Suitable for compression & screw fittings
- Ideal for wet or dry surfaces
- Easy to remove when required
- Safe to use with drinking water
- WRAS approved product
Sample text. Click to select the text box. Click again or double click to start editing the text.
Sample text. Click to select the text box. Click again or double click to start editing the text. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Technical Specifications
Physical and chemical properties
- Appearance: Sealant
- Colour: Milky white
- Odour: Mild, Acidic
- One-year guarantee
- Ready-to-use compound
- Cures in two hours
- Resealable tube
- WRAS approved
- Suitable for use with hot or cold water
Dosage Instructions
Maintain peak performance
1. Ensure water pressure has been relieved prior to application and during setting. Drain system if necessary
2. Clean and prepare surface before use for good adhesion
3. Carefully apply MCXS from the tube
4. Once applied the sealant can be moulded
5. For sealing burst pipes, Incorrect datasheet
MCXS can be used with a binding bandage to aid repair
6. Replace cap immediately after use
7. Allow a minimum of 2 hours and up to 12 hours for MCXS to set. Curing time dependent on amount applied, and can be accelerated by spraying with water
MC-XS may be used as a jointing compound on hot and cold water services, including potable water, in place of traditional materials. Reinforcement is generally not required, but reinforcement fibre may be used on larger pipe sizes. The use of reinforcement material is advisable for larger leaks and higher pressures.
Sample text. Click to select the text box. Click again or double click to start editing the text.
Homeowner Benefits
- 1 year guarantee
- Ready to use compound
- Cures in 2 hours
- Resealable tube
- WRAS approved
- Suitable for use with hot or cold water
Get straight to the products you need in a few clicks.


Find a Stockist
Enter your postcode to find your nearest merchant.
RELATED PRODUCT

MC4 internal leak sealer
Our highly concentrated MC4 is an incredibly effective way to deal with small leaks. Protecting and sealing from the inside, it can infiltrate really hard to reach places, reducing the need for a more costly repair.
One dose could be all it takes to fix the leak and restore pressure.

RELATED PRODUCT
MC4 internal leak sealer
Our highly concentrated MC4 is an incredibly effective way to deal with small leaks. Protecting and sealing from the inside, it can infiltrate really hard to reach places, reducing the need for a more costly repair.
One dose could be all it takes to fix the leak and restore pressure.
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