Honda Hondabond HT high-temp RTV gasket maker 08718-0001 — oil & coolant resistant flexible seal

Honda 08718-0001 Hondabond HT is a high-temperature RTV silicone gasket maker formulated by Honda for sealing engine components where heat resistance and oil/antifreeze compatibility are required.

Designed and specified by Honda, Hondabond HT (part number 08718-0001) is a ready-to-use, high-temperature adhesive sealant meant for forming reliable gaskets on Honda engines and components. It cures to a flexible, resilient rubber that resists oil, coolant and vibration, making it suitable for valve covers, oil pans, timing covers and other engine joints where a custom-fit seal is preferred over pre-cut gaskets.

How does Hondabond HT handle engine heat and fluids?

Hondabond HT is formulated to withstand the elevated temperatures found in engine compartments while maintaining a durable seal against common automotive fluids. Its cured silicone remains flexible, reducing the chance of leaks caused by thermal cycling and vibration.

• High-temperature silicone base resists engine heat.
• Compatible with oil and coolant to prevent chemical breakdown.
• Flexible cured rubber tolerates vibration and movement.
• OEM formulation for reliable long-term performance.

Where should I use Hondabond HT on my Honda vehicle?

Hondabond HT is intended for engine sealing applications that require a formed gasket or a bead seal. Use it on valve covers, oil pans, timing-case joints and other flat-to-flat engine surfaces where OEM guidance allows silicone gasket maker.

• Valve cover sealing on both older and newer Honda engines.
• Oil pan and transmission case flange applications.
• Water pump housings and thermostat housing faces where permitted.
• Areas recommended by Honda service literature for RTV use.

How do I apply Hondabond HT for the best seal?

Surface preparation and correct bead size are key for a reliable seal. Clean mating surfaces of oil, debris and old gasket material; apply a continuous bead of Hondabond HT and allow the recommended flange squeeze before final assembly.

• Clean and dry surfaces; remove old gasket remnants and oil.
• Apply a uniform bead appropriate to the flange width (follow service manual specs).
• Tighten bolts to specified torque after initial cure time if instructed.
• Allow full cure per Honda guidelines before exposing to fluids and heat.

Will Hondabond HT replace OEM gaskets permanently?

Hondabond HT creates a formed gasket that is recognized by Honda for many service procedures, but it is not a universal replacement for every OEM gasket. For critical sealing surfaces with specific gasket geometry or multi-layer metal gaskets, use the Honda-specified replacement part.

• Ideal where Honda service allows RTV gasket maker.
• Not a substitute for specialty metal or multi-layer gaskets when required.
• Use Honda part numbers and service manual guidance for permanent repairs.

Who is this for: Hondabond HT 08718-0001 is intended for Honda owners, technicians and DIY mechanics who service Honda engines and need an OEM-specified, high-temperature silicone gasket maker. It suits routine engine maintenance and repairs where a flexible, fluid-resistant formed gasket is appropriate and Honda service documentation permits RTV use.