Hylomar Universal Blue jointing compound 40g — non-setting, reusable engine & gearbox sealant

Hylomar Universal Blue 40g is a non-setting, reusable jointing compound that seals metal and plastic joints against oils, fuels, water and high temperatures without hardening.

When gaskets wear or threaded fittings leak, a dependable joining compound can restore a tight, long-lasting seal without the need for permanent adhesives. Hylomar’s Universal Blue has been used across automotive and industrial applications for decades; its non-setting formula provides flexibility for repeated assembly and disassembly while resisting common vehicle fluids and elevated temperatures.

How does Hylomar Universal Blue stop leaks on engine and gearbox components?

The paste fills micro-gaps between mating surfaces and forms a fluid-resistant barrier that remains flexible rather than curing into a rigid plug. Its formulation tolerates oils, fuels, lubricants and water so it protects seals under typical operating conditions without chemical breakdown.

• Applies smoothly to flange faces, preformed gaskets and threaded connections.
• Maintains pliability to allow future maintenance and resealing.
• Resists common automotive fluids to reduce repeat leaks.

Can I use Hylomar Universal Blue on plastic parts or sensitive assemblies?

Yes — because the compound does not harden it is suitable for metal-to-metal, plastic-to-plastic and mixed-material joints where rigid sealants could cause stress or cracking. It provides a reliable seal without introducing solvents or setting agents that might damage delicate components.

• Safe for use on many plastics and coated surfaces where flexibility matters.
• Works well on threaded fittings and flange joints without seizing parts.
• Ideal for assemblies that require periodic inspection and resealing.

What operating temperatures and fluids can this 40g tube withstand?

Hylomar Universal Blue is formulated to perform across a broad temperature range encountered in engines and transmissions, and it resists breakdown from fuels, oils and common lubricants. While not a permanent chemical cure, its physical resistance makes it suitable for many automotive and industrial service conditions.

• Effective across engine and gearbox temperature ranges encountered in service.
• Compatible with petrol, diesel, engine oils, gear oils and many lubricants.
• Retains sealing properties without hardening or becoming brittle over time.

How much product do I get and what are the practical benefits of the 40g tube?

The pack contains a 40g tube, convenient for occasional repairs, maintenance tasks and professional use where small quantities are needed. The compact tube fits tool kits and service trays, offering precise application and minimal waste compared with larger tubs.

• 40g tube for controlled, mess-minimised application.
• Suitable for spot repairs, gasket dressing and threaded joint sealing.
• Easy storage in toolboxes or parts drawers for on-the-spot maintenance.

Who is this for? Hylomar Universal Blue 40g is aimed at mechanics, restoration specialists, DIY vehicle owners and industrial technicians who need a dependable, non-hardening jointing compound. It’s especially useful when components will be removed again, when mixed materials are involved, or where resistance to oils and fuels is essential. Backed by Hylomar’s long history in automotive sealing technology, this compact tube offers a flexible, service-friendly sealing solution for routine maintenance and emergency repairs.