1. Automotive Fluids & Chemicals Offers
  2. sku: 11421840036420711
  3. PERMATEX 81855

PERMATEX Gasket 079340818552 4.5

fits model: Rtv. make: Can.

81855 Permatex 4.5 Oz Can Rtv Gasket

( Brand: Permatex ), ( Manufacturer Part Number: 81855 ), ( Part Type: Gasket ), ( UPC: 079340818552 )

Review PERMATEX 4.5 Oz Can Gasket fits RTV

The **Permanent 81855 4.5 oz. RTV Gasket Maker** is a high-performance, two-part silicone-based sealant designed to create durable, flexible gaskets and seals for a wide range of automotive, mechanical, and industrial applications. This premium-grade product combines a fast-curing, high-temperature-resistant silicone rubber with a precise mixing ratio, ensuring exceptional adhesion, weather resistance, and long-term reliability. Ideal for sealing gaps, joints, and interfaces where traditional gaskets may fail under extreme conditions, the 81855 excels in environments exposed to heat, vibration, moisture, and chemical exposure, making it a trusted choice for professionals and DIY enthusiasts alike. Its low odor formula minimizes fumes during application, while its non-sag consistency allows for clean, professional finishes on flat or slightly contoured surfaces. Whether used to restore or replace worn gaskets in engine components, exhaust systems, or HVAC assemblies, or to create custom seals for custom fabrication projects, this gasket maker delivers a durable, flexible seal that maintains its integrity over time. With a working time of approximately 10 15 minutes and a cure time of 24 hours at room temperature, it offers a practical balance between convenience and performance, ensuring a secure bond that resists cracking, shrinking, or degrading under stress. Built to withstand temperatures ranging from -65 F to 500 F (-54 C to 260 C), the 81855 is engineered for demanding applications, including automotive exhaust systems, brake components, and even some aerospace and marine uses where reliability is non-negotiable. Its ease of use, combined with its superior durability, makes it a go-to solution for anyone seeking a long-lasting, high-quality sealant that stands up to the toughest conditions.

**Pros and Cons of Buying Permatex 81855 4.5 oz. RTV Gasket Maker**

**Pros:**

1. **High-Quality Sealant:** Permatex 81855 is a silicone-based RTV (Room Temperature Vulcanizing) gasket maker known for its durability and reliability. It forms a strong, flexible seal that resists heat, vibration, and moisture, making it suitable for a wide range of applications, including automotive, mechanical, and household uses.

2. **Versatile Application:** This product can be used for sealing gaskets, joints, and flanges in engines, transmissions, exhaust systems, and other mechanical components. It also works well for sealing around windows, doors, and other structural gaps in homes or buildings.

3. **Easy to Apply:** The product comes in a convenient tube with a nozzle tip, allowing for precise application. It cures quickly at room temperature, reducing downtime and making it practical for DIY projects or professional repairs.

4. **Resistant to Extreme Conditions:** The sealant is designed to withstand temperatures ranging from -65 F to 500 F (-54 C to 260 C), making it ideal for applications exposed to harsh environments, such as under the hood of a car or in industrial settings.

5. **Non-Conductive:** Unlike some other sealants, Permatex 81855 is non-conductive, which is beneficial for applications where electrical insulation is required.

6. **Long Shelf Life:** When stored properly in a cool, dry place, the product maintains its effectiveness for an extended period, ensuring you have it available when needed.

7. **Compatibility:** It bonds well with various materials, including metal, glass, rubber, and plastic, making it a versatile choice for different sealing needs.

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**Cons:**

1. **Limited Color Options:** The product is typically available in clear or black, which may not be suitable for all aesthetic applications. Some users prefer colored sealants for better visibility or matching purposes.

2. **Messy Application:** While the nozzle tip helps with precision, silicone-based sealants can still be messy to apply, especially for beginners. Overapplication or improper technique can lead to excess product that needs to be cleaned up.

3. **Cleanup Challenges:** Silicone-based sealants can be difficult to remove once cured. Solvents like acetone or alcohol may not fully dissolve the cured sealant, requiring mechanical means (e.g., scraping) to clean up mistakes.

4. **Shrinkage During Curing:** Some users report that the sealant may shrink slightly as it cures, which could lead to gaps if not applied thickly enough. This requires careful application to ensure a complete seal.

5. **Not Ideal for High-Pressure Applications:** While it performs well in many scenarios, Permatex 81855 may not be suitable for high-pressure sealing applications, such as hydraulic systems or plumbing with extreme pressure, where specialized sealants are recommended.

6. **Sensitivity to Moisture Before Curing:** Although it cures at room temperature, the product must not be exposed to moisture (e.g., humidity or water) before it fully sets, as this can affect adhesion and curing quality.

7. **Cost:** Compared to some generic or lower-quality sealants, Permatex 81855 is priced on the higher end. For occasional or minor sealing needs, it may be more expensive than necessary.

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**Conclusion:**

Permatex 81855 4.5 oz. RTV Gasket Maker is a high-performance, versatile sealant that excels in durability, temperature resistance, and ease of use. Its reliability and compatibility with various materials make it a top choice for automotive, mechanical, and household sealing tasks. However, its messy application, cleanup difficulties, and higher cost may be drawbacks for some users, particularly those with limited experience or budget constraints.

For most users seeking a long-lasting, high-quality sealant for critical applications, the benefits outweigh the drawbacks. If you prioritize performance and longevity, this product is well worth the investment. However, if you are working on a project with aesthetic concerns or require frequent, low-cost sealing, you may want to consider alternatives or complementary products.

**Recommendation:** Buy Permatex 81855 4.5 oz. RTV Gasket Maker if:

- You need a durable, heat-resistant sealant for automotive, mechanical, or structural applications.

- You are willing to invest in a high-quality product that offers long-term reliability.

- You are comfortable with the application process and potential cleanup challenges.

Consider alternatives if:

- You require a colored sealant for visibility or aesthetic reasons.

- You are working on a budget-sensitive project and can find a suitable lower-cost option.

- You need a sealant specifically designed for high-pressure applications or extreme conditions beyond the product s rated limits.

Details:

Permatex 81855 4.5 Oz Can Rtv Gasket: Part Number: Manufacturer. Made of high-quality components for durability, reliability, and performance. Manufactured following strict OE standards to work like the original component. Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle.

Engineered using the latest technology to ensure product lasts longer in service. Designed specifically for trucks, trailers, and buses.

part #: 81855 price

  • $25.37

specifications automobilefluids:

  • for models: Rtv
  • for makes: Can
  • brand: Permatex
  • mpn: 81855
  • part type: Gasket
  • upc: 079340818552

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  • other
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shipping automobilefluids:

  • class: Standard
  • cost: $0.00
  • type: Fixed
  • transit: 4-10 Days
  • service: Standard

offer automobilefluids:

  • best offers: True
  • quantity: 4
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: February 7, 2026

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  • paid by: Seller
  • policy: Returns Accepted
  • time: 30 Days

general automobilefluids:

  • condition: New
  • Automotive Tools Supplies > Fluids Chemicals > Gasket Makers/Removers/Sealers

seller automobilefluids:

  • city: Los Angeles, California
  • rating: 99.2%
  • # reviews: 64446
for models: rtv, for makes: can, part type: gasket,
category: auto parts > tools supplies > fluids chemicals > gasket makers/removers/sealers, sku: 11421840036420711,
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