Jet Blue Plus is a trusted jointing compound used by plumbers across the UK for sealing threaded pipe joints. Works on metal and plastic fittings, remains workable after application, and provides a reliable, leak-free seal on water and gas installations.
Jet Blue Plus jointing compound has been a go-to product for plumbers for a long time, and there’s a good reason for that. It seals threaded joints on both metal and plastic pipework, resisting water, gas, and a range of other media without hardening to the point where disassembly becomes a nightmare. If you’ve ever had to unscrew a joint sealed with the wrong compound, you’ll know exactly why that matters.
Applied directly to the male thread before assembly, Jet Blue Plus fills the gaps between threads and cures to a tough, pressure-resistant seal. It stays slightly flexible once set, which helps it cope with minor vibration and thermal movement without cracking. That’s particularly useful on heating systems where pipes are regularly expanding and contracting.
Where Jet Blue Plus Jointing Compound Gets Used
This compound is widely used on domestic and light commercial plumbing installations. It’s suitable for hot and cold water systems, central heating pipework, and natural gas and LPG fittings where the compound has the appropriate approvals. It works on compression fittings, BSP threads, and most standard plumbing connections you’ll encounter on a typical job.
Jet Blue Plus is also compatible with PTFE tape when used together for additional security on gas or high-pressure applications, though on most water installations the compound alone is sufficient. It applies easily from the tub with a brush or the applicator, gives good coverage, and doesn’t run or drip during assembly.
For plumbers who want a reliable, no-fuss jointing compound that covers most situations on site, Jet Blue Plus is a sensible choice. It’s been around long enough to have a solid track record, and at this price point it’s easy to keep a tub in the van without worrying about the cost.
Pro Tip: Apply Jet Blue Plus to the male thread only and work it into the thread form before assembly, this ensures even coverage and avoids excess compound being pushed into the pipe bore where it can cause blockages in fine strainers or valves.
Jet Blue Plus jointing compound is used by plumbers and heating engineers on threaded pipe joints throughout domestic and commercial installations. It's a practical choice for hot and cold water supply pipework, central heating systems, and gas installations where an approved compound is required. Works on both steel and copper male threads, as well as most plastic threaded fittings commonly found in modern plumbing systems.
Best For
Threaded pipe joint sealing
Hot and cold water systems
Central heating pipework
Natural gas and LPG fittings
Domestic and light commercial plumbing
Compatible Surfaces
Steel threaded fittings
Copper male threads
Plastic threaded fittings
BSP compression joints
Iron pipe threads
Key Properties
Remains slightly flexible when cured
Pressure-resistant seal
Suitable for use with PTFE tape
Brush or spatula application
Resists vibration and thermal movement
Not suitable for: Not suitable for use on push-fit connections or solvent-welded plastic joints. Always check approval ratings before use on gas pipework to confirm the compound meets current regulations for the installation type.
Clean the male thread thoroughly before applying Jet Blue Plus, removing any debris, old compound, or moisture. Apply a generous, even coat to the thread using a brush or the built-in applicator, working the compound into the thread form. Assemble the joint immediately and tighten to the correct torque. Allow adequate cure time before pressurising the system.
Clean the male thread with a cloth or wire brush to remove dirt, old sealant, and moisture
Open the Jet Blue Plus tub and stir if the compound has settled
Apply an even coat of compound to the male thread only, working it well into the thread profile
Assemble the joint by hand first, then tighten to the correct torque for the fitting type
Wipe away any excess compound that squeezes out during tightening
Allow the joint to cure before pressure testing or bringing the system into service
Can Jet Blue Plus be used on gas pipework?
Jet Blue Plus is suitable for use on natural gas and LPG installations, but you should always check the current approval status and ensure the compound meets the requirements for the specific application. When in doubt, use in conjunction with PTFE tape and confirm compliance with current Gas Safe guidelines.
Is Jet Blue Plus suitable for plastic threaded fittings?
Yes, Jet Blue Plus is compatible with most plastic threaded fittings used in standard plumbing systems. Apply to the male thread as normal and avoid over-tightening plastic fittings, which can crack regardless of the compound used.
How long does Jet Blue Plus take to cure before the system can be pressurised?
Cure time depends on temperature and the media being sealed, but as a general guide allow at least one to two hours before pressure testing a water system under normal conditions. For gas installations, follow the relevant commissioning procedures and allow full cure before live testing.
Jet Blue Plus is a paste-form pipe jointing compound formulated for sealing threaded connections in plumbing and heating systems. It cures to a firm but slightly flexible seal that resists water, gas, and common system fluids. The compound is designed to remain workable during assembly and to resist the pressures and temperatures typical of domestic and light commercial pipework installations.
Product Type
Pipe jointing compound
Form
Paste
Application Method
Brush or spatula
Suitable Media
Water, gas (check approvals), central heating fluid
Thread Types
BSP, NPT, and standard plumbing threads
Compatibility
Metal and plastic threaded fittings
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