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. 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.
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