MOTUL 102991 is a fast-penetrating rust solvent from MOTUL that creeps into corroded threads and joints. It loosens seized bolts, nuts and fittings, displaces moisture and leaves a fine lubricating film. Stuck connections that would otherwise snap or strip come free with far less force.

Purpose and specifications

This product is designed to free corroded, seized and stuck metal connections during repair and maintenance work. Its capillary action carries the active ingredients deep into the thread, breaking down rust bonds and lubricating the contact surfaces so parts can be separated without damage.

• Loosens seized bolts and nuts while displacing moisture
• Leaves a light lubricating film that eases disassembly
• Creeps quickly into rusted threads, joints and fittings

When to use / change?

Apply it before attempting to loosen any corroded connection and let it penetrate for several minutes; repeat on heavily rusted parts. It is also useful as light preventive lubrication on exposed hardware. Stored sealed, the shelf life is approximately 5 years.

Frequently asked questions

How long does it need to penetrate?
A few minutes is usually enough; heavily corroded joints benefit from a second application and longer contact time.

Does it protect against new rust?
It displaces moisture and leaves a light film, but for lasting protection use a dedicated anti-corrosion product.

Can I use it on mechanisms?
Yes, it is commonly used on hinges, linkages and threaded connections; follow the label directions.

Suitable for: corroded bolts, nuts, hinges and metal joints on vehicles and equipment. Follow the safety instructions on the label. Art.: 111651.