Permatex 51813 Anaerobic Gasket Maker, 50 ml Tube , Red

Permatex 51813 Anaerobic Gasket Maker is a red, anaerobic-formula sealant that fills small flange gaps and cures to a solvent-resistant, non-corrosive gasket for aluminum, iron, and steel mating surfaces.

This 50 ml tube provides a convenient, on-the-spot solution when a cut gasket is not available or when an emergency repair is needed. Designed for mechanical assemblies such as water pumps, thermostat housings, transmission pans and transaxle cases, the anaerobic chemistry cures only in the absence of air between metal surfaces to create a durable seal that resists tearing and solvent attack. It dispenses smoothly from a small tube, fills gaps up to 0.015 inches, and allows for later disassembly without damaging components.

How does this gasket maker perform on metal flanges?

The Permatex anaerobic formula bonds to common automotive metals and cures into a flexible, solvent-resistant gasket. It’s engineered to remain non-corrosive so mating surfaces aren’t weakened over time, and it resists tearing during normal service.

• Forms reliable seals on aluminum, iron and steel flanges
• Fills up to 0.015" gap for imperfect surfaces
• Cures to a solvent-resistant, pliable gasket that withstands service

Can I use it for emergency repairs or when a gasket is missing?

Yes — the small tube is intended for immediate repairs and field fixes where a traditional gasket is not available. Apply, assemble the parts and allow the anaerobic cure to occur where air is excluded between the mating surfaces.

• Ideal for quick fixes and emergency on-vehicle repairs
• Works as an o-ring replacement or to patch torn gaskets
• Easy to dispense from a 50 ml tube for controlled application

Will I be able to take parts apart later without damage?

Yes — despite forming a strong, solvent-resistant seal, the cured material allows disassembly and cleanup. Old gasket material peels or scrapes away cleanly with a putty knife, saving time during later repairs or maintenance.

• Parts disassemble after extended service without seizure
• Old cured gasket removes quickly with basic tools
• Designed to prevent corrosion on mating surfaces for easier service

What applications are best suited to this product?

This gasket maker is commonly used on engines and driveline components that require a form-in-place gasket with solvent resistance. Typical places include water pump housings, thermostat covers, transmission pans and transaxle casings where irregular surfaces or missing gaskets exist.

• Water pumps and thermostat housings
• Transmission pans and case covers
• Transaxle casings and o-ring replacements

Who this is for: Mechanics, DIYers and fleet technicians who need a compact, reliable gasket solution for metal-to-metal joints will find Permatex 51813 useful. It’s geared toward situations where machining or custom-cut gaskets aren’t practical, and for repairs that demand a solvent-resistant, non-corrosive seal that still allows later disassembly. Choose this product when you want a small, ready-to-use tube for emergency sealing, routine maintenance, or replacing worn gaskets on aluminum, iron, or steel components.