Premium High-Temp Sealant for Extreme Automotive Applications – Ultra Plus® 999 RTV Silicone Gasket Maker delivers super high-temperature resistance up to 650°F (343°C) and is specially designed for exhaust manifolds, turbo systems, and high-performance engine components. With a neutral cure, low odor formula, it is oxygen sensor safe and non-corrosive, making it ideal for modern engines and emissions systems.

Ultra Plus® 999 RTV Silicone Gasket Maker

Oxygen Sensor Safe

Sensor-safe formulation ensures compatibility with modern engine electronics and emissions systems.

Non-Corrosive

Neutral cure chemistry won’t damage sensitive components or metal surfaces—safe for aluminum and other alloys.

Super High Temp: Effective Up to 650°F (343°C)

uilt to withstand extreme heat from exhaust manifolds, turbochargers, and other high-temp applications.

Great for Exhaust Manifolds

Engineered for areas exposed to intense thermal cycling and vibration—provides a strong, lasting seal.

Neutral Cure, Low Odor

Low-odor formula is ideal for enclosed spaces and professional repair environments.

Flexible, Leak-Proof Seal

Cures into a durable, flexible gasket that resists cracking, shrinking, and leaks under pressure and heat.

Ideal For:

• Exhaust manifolds and turbo systems

• Timing covers, valve covers, oil pans

• Oxygen sensor-equipped vehicles

• Import and domestic high-performance engines

• Automotive professionals and advanced DIYers

Why Choose Ultra Plus® 999?

For the highest level of temperature resistance, reliability, and sensor-safe performance, Ultra Plus® 999 is the go-to sealant for demanding engine repairs. It’s trusted by professionals who need a clean cure and powerful hold—especially under pressure.