J-B Weld 32329 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant

J-B Weld 32329 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant – World’s Strongest Bond

J-B Weld Ultimate Black is a 100% RTV silicone gasket maker & sealant designed for engines and driveline work where maximum contact with oil and petroleum products is expected. On clean metal flanges, it lays an even bead, skins in about 1 hour, and cures to a flexible black gasket that won’t shrink or crack. The formula is sensor safe and low odor, so it’s suitable around O₂ sensors and modern engine management. Built for high clamp loads and vibration, Ultimate Black is a dependable choice for sealing oil pans, valve covers, transmission pans, and timing gear covers. Once fully cured (about 24 hours), it forms a waterproof seal and resists intermittent temperatures up to 700°F and excellent peformance up to 500°F, supporting everyday automotive service from passenger cars to fleet equipment.

J-B Weld 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant At a Glance

• Maximum Oil Resistance: Stands up to engine oil and petroleum exposure.
• RTV 100% Silicone, Sensor Safe: Compatible near O₂ and other sensors; low odor during use.
• 1-Hour Set / 24-Hour Cure: Skins quickly; returns to service after full cure.
• 700°F Intermittent Temp Rating: Handles under-hood heat and thermal cycling.
• Flexible, Non-Shrinking Seal: Maintains clamp load on uneven metal flanges.
• Clean Application: Tapered nozzle helps place a continuous 1/8″ bead.
• Cure Color Black: OEM-style appearance on engines and pans.
• Made in USA: Shop-grade quality and consistency.

Markets

• Automotive Repair & Performance: Daily sealing on engines and transmissions.
• Heavy Truck & Fleet Maintenance: Quick pan/cover sealing across mixed vehicles.
• Powersports & Motorcycles: Compact covers and cases subject to heat and vibration.
• Small Engine & Outdoor Power: Mowers, generators, compressors, and pumps.
• Municipal & Facility Garages: Reliable stock RTV silicone for service bays.
• Trade Schools & Technical Programs: Demonstrates correct gasket maker technique.

Mechanics choose Ultimate Black when a gasket maker must tolerate constant oil contact and heat without leaking. The bead tools easily, skins in about an hour, and cures to a flexible seal that holds up on oil pans, valve covers, transmission pans, and timing covers. Because it’s sensor safe and low odor, it fits modern shop environments and avoids issues with emissions components. For routine bay work and fleet maintenance, it delivers consistent sealing performance that reduces rework and keeps vehicles moving.

J-B Weld 32329 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant Features

• 100% RTV Silicone: Forms a tough, waterproof gasket on metal flanges.
• Maximum Oil Resistance: Built for engines and driveline components.
• Temperature Resistant to 700°F (intermittent): Withstands under-hood hot spots.
• Won’t Shrink or Crack: Maintains a long-term seal under vibration.
• Sensor Safe, Low Odor: Suitable around sensitive components.
• Simple Procedure: Clean → apply continuous 1/8″ bead (surround bolt holes) → assemble while wet → hand-tighten → after ~1 hour final-torque an additional 1/4 turn → scrape excess after cure.
• Made in the USA: Consistent manufacturing quality.

J-B Weld 32329 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant Includes

• (1) 3 oz (85 g) tube of Ultimate Black RTV Silicone
• (1) Tapered application nozzle

J-B Weld 32329 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant Specifications

• Type: RTV silicone gasket maker & sealant
• Volume: 3 oz (85 g)
• Set (Skin) Time: 1 Hour
• Full Cure: 24 Hours
• Dry/Cure Color: Black
• Temperature Resistance: Up to 700°F intermittent
• Chemicals: Oil/Petroleum resistant, waterproof
• Typical Uses: (4) Oil pans; Valve covers; Transmission pans; Timing gear covers
• Substrates: Metal (machined flanges)
• Category: Automotive
• UPC: 043425323293
• Country of Origin: USA

Why Customers Select the J-B Weld 3oz Ultimate Black RTV Silicone Gasket Maker & Sealant

Service bays reach for this black RTV gasket maker when sealing jobs live in oil—oil pan gaskets, transmission pans, and valve covers. The 1-hour set time fits normal reassembly, while a 700°F intermittent rating and sensor-safe chemistry suit modern engine bays. After cure, the flexible silicone keeps clamp load, resists leaks, and holds up to heat cycles without cracking. With easy bead control and dependable oil resistance, Ultimate Black gives technicians a clean, repeatable way to seal engines and driveline components on cars, trucks, and equipment.