Explore the dynamic world of adhesives where Hondabond 4 and HT shine as top picks for automotive and high-temperature challenges.
More than just sealants, they’re reliable partners in garages and workshops, ensuring everything from engines to equipment stays sealed and performs well.
Each one boasts its own set of strengths and has a solid following. We’ll explore what sets them apart, how they are used, and their effectiveness for various tasks.
Whether in the trade or tackling a project at home, getting to know these sealants could be your key to success.
What is Hondabond 4?
Hondabond 4 is a semi-drying, solvent-borne synthetic-rubber liquid gasket for engine and drivetrain flanges. It fills minor surface irregularities and dries by solvent evaporation to a rubber-like, gasoline/oil/water-resistant elastic film. Typical service temperature is ≈−40 °C to +150 °C.
Apply a thin, continuous bead, allow a brief solvent flash (about 1–3 minutes), then assemble and torque to spec. Clamp load from the fasteners provides the pressure retention—this is a sealing film, not a structural adhesive.
Typical use cases include crankcase halves, clutch and inspection covers, transmission side covers, and similar metal-to-metal flanges. Avoid large gaps or continuous underwater service; use a solid gasket where the service manual specifies one.
What is Hondabond HT?
Hondabond HT (Honda part 08718-0004) is a high-temperature RTV silicone “formed-in-place” gasket used where a solid gasket isn’t required (e.g., cam/rocker covers, oil pans, timing covers).
Apply a thin, continuous bead; allow about 1 minute before assembly, then torque to spec. Effective temperature range is listed as 75 °F to 600 °F, non-acidic, and resistant to oil, water, and most chemicals.
It moisture-cures to a flexible rubber bead and is designed for vibration-prone joints in engine service.
How are they different?
• Temperature Resistance: Hondabond HT has the higher ceiling (effective to about 600 °F). Hondabond 4 typically serves to about +150 °C (≈302 °F).
• Chemical Composition: Hondabond 4 is a solvent-borne synthetic-rubber liquid gasket (semi-drying). Hondabond HT is an oxime-cure RTV silicone that moisture-cures to a flexible rubber.
• Brand vs. Category: Both are specific Honda OEM sealants—Hondabond 4 (semi-drying liquid gasket) and Hondabond HT (high-temperature RTV silicone).
• Application Specificity: Hondabond 4 excels on metal-to-metal flanges and case halves where fuel/oil resistance matters. Hondabond HT is preferred for non-fuel-immersed covers and pans that see heat and vibration and where a flexible silicone bead is specified.
• Availability: Both are Honda OEM products and broadly available from powersports/auto suppliers; HT availability is often higher because it’s specified for many routine service jobs.
How are they similar?
• High-Temperature Performance: Both are used in hot engine areas, but HT covers the higher temperature range; Hondabond 4 targets typical engine case temps.
• Sealing Properties: Each provides excellent sealing capabilities, preventing leaks and ensuring tight joins between surfaces.
• Resistance to Fluids: Both resist oil and coolant after cure; Hondabond 4 also lists gasoline resistance for flange sealing, whereas HT is generally used outside continuous fuel immersion.
• Durability: Designed for longevity, both Hondabond 4 and HT sealants resist degradation over time, even in challenging conditions.
• Ease of Use: They can be applied without specialized tools, making them accessible for professionals and DIY enthusiasts.
What’s better about Hondabond 4?
• Brand Reliability: Coming from Honda, a trusted name in the automotive industry, Hondabond 4 promises consistent quality and performance.
• Specific Formulation: It’s specifically formulated for automotive applications, ensuring optimal engine and transmission sealing performance.
• User Feedback: Hondabond 4 is a specific product, so users can find a wealth of reviews and experiences related to it, aiding in informed decision-making.
• Compatibility: Its formulation is tailored to work exceptionally well with Honda parts, making it an ideal choice for Honda vehicle repairs.
• Professional Endorsement: Many automotive professionals prefer it for its proven track record in demanding scenarios.
What’s better about Hondabond HT?
• Versatility: As a category, HT sealants can be chosen from a range of products tailored to specific needs, whether for automotive, industrial, or other high-temperature applications.
• Temperature Range: Hondabond HT is specified effective up to about 600 °F, making it the better pick for hotter covers and exhaust-adjacent areas.
• Availability: Being a broader category, HT sealants are widely available and can be sourced from multiple manufacturers.
• Price Options: Various brands and products allow users to find an HT sealant that fits their budget without compromising the necessary features.
• Innovative Formulas: Continuous competition among manufacturers leads to innovation and potentially more advanced adhesive solutions within the HT category.
Who should get Hondabond 4 (and why)?
• Honda Vehicle Owners: For those with Honda vehicles, Hondabond 4 is the go-to for repairs and maintenance, ensuring compatibility and reliability.
• High-Performance Enthusiasts: Users who demand a proven product with a strong reputation in high-stress scenarios will appreciate Hondabond 4’s track record.
• Professionals Seeking Consistency: Mechanics and professionals who value consistency and reliability in their adhesives might prefer the assurances of a brand-name product like Hondabond 4.
Who should get Hondabond HT (and why)?
• Individuals Needing High-Temperature Solutions: An HT sealant might offer resistance for those dealing with environments that exceed the typical automotive temperature ranges.
• Budget-Conscious Shoppers: Users who need a reliable sealant but are working with a tighter budget can find an HT product that meets their needs without the brand-name price.
• Versatility Seekers: Those who need a high-temperature adhesive for various applications, not just automotive, might find the perfect match in the diverse HT category.
Hondabond 4 Vs. Hondabond HT: A recap
Hondabond 4 and HT sealants serve similar purposes but cater to different needs and preferences. Hondabond 4 offers the reliability and specificity of a branded product, ideal for Honda vehicles and high-performance demands.
On the other hand, HT sealants provide versatility, a range of options, and often a more extensive temperature resistance, making them suitable for a broader array of high-temperature applications.
The choice between the two will largely depend on the specific requirements of the task at hand, the operating environment, and personal preferences for brand versus performance characteristics.