Code: 41821
  • Keeps hydraulic seals soft and pliable
  • Reduces friction and wear in hydraulic systems
  • Cleans and prevents harmful formation of sludge and varnish
  • Helps hydraulic systems run cooler and last longer
  • Mixes with all factory approved hydraulic fluids and synthetics

Rislone Hydraulic Seal is specially designed to repair hydraulic fluid leaks, reduce friction/wear and renew seals and O-rings in hydraulic systems. This product is engineered to be professional-grade and is safe to use for consumer applications as well as commercial use cases. Rislone Hydraulic Seal works with all petroleum and synthetic fluids, pump seals, control valve seals, actuators, rams, cylinders, O-ring boss fittings and hydrostatic transmissions.

All of our leak repair solutions are the result of over 70 years of extensive research. Since our first year in business, we’ve been synonymous with stopping leaks in consumer, commercial, OEM and even military applications. When you choose Rislone, you can depend on proven performance at a reasonable price, backed by a company that knows leaks better than anyone else in the world.
Will Rislone Hydraulic Seal work with all regular types of hydraulic fluids?
Yes, Rislone Hydraulic Stop Leak is compatible with all petroleum based, mineral oil, and synthetic fluids. Do not use with water-glycol or phosphate ester flame retardant hydraulic fluids. Do not use in brake fluid systems.
How does Hydraulic Seal work?
After time, hydraulic seals and o-rings tend to dry out and shrink. Rislone revitalizes these seals and o-rings and makes them soft and pliable again.
How much Hydraulic Seal do I install?
41820 (950mL) and bulk are designed to be installed with one ounce per quart of fluid. When using the 41812 (Hydraulic Jack Oil with Stop Leak) top off fluid levels as needed.
How much Hydraulic Seal does a package treat?
41820 (950mL) – one bottle treats 30 liters
41821 (3.8L) – one bottle treats 121 liters

If first application does not completely stop leak, may I add another dosage?
Yes, you can install a second application for hard to stop leaks. If your leak still persists after a second application, then mechanical attention is needed, and replacement of seals may be required.

Can Hydraulic Seal be used for preventative maintenance to help prevent leaks?
Yes, this is a great product to use in older systems to keep them working properly not only to prevent leaks, but keep the system lubricated and protected. The recommended preventative maintenance dose is ½ ounce per quart of fluid capacity.
How long does it take to start working?
Rislone Hydraulic Seal starts working the minute you install and start using equipment. Most leaks are sealed within a few hours of application and usage. Some leaks can take longer, up to a few days. Old accumulation of fluid on outside of system may drip for a few days after leak has stopped.
My hydraulic system uses motor oil, can I still use Hydraulic Seal?
Yes, Hydraulic Seal will mix and work perfectly in a hydraulic system using motor oil.
Will Hydraulic Seal change the fluid viscosity?
No, this product will not affect painted surfaces any differently than straight hydraulic fluid.
Will Hydraulic Seal harm painted surfaces?
No, this product will not affect painted surfaces any differently than straight hydraulic fluid.
Will Hydraulic Seal harm hoses?
No, this will not harm or affect hoses in any way.
What is the difference between hydraulic fluid and hydraulic oil?
Nothing, they are the same thing, just a terminology difference.
Technical Data Sheet

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