Adcoseal - B-100 Butyl Rubber Sealant - 10.3 oz Cartridge - Black - Exterior RV Tank Sealant

Seal leaks and seams on your RV with confidence using the B-100 Butyl Adcoseal, a specialized sealant that offers excellent adhesion and remains permanently flexible. Easy to apply with a standard caulking gun, it’s non-staining, resists weathering, and bonds to glass, metal, wood, masonry, and more—making it ideal for exterior tank and surface repairs. Enjoy lasting protection and a hassle-free application every time.
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When you need a professional-grade RV tank sealant that stands up to extreme weather and constant vibration, Adcoseal B-100 Butyl Rubber Sealant delivers the permanently flexible, weatherproof seal that RV owners and technicians trust. This single-component butyl-based sealant is specifically engineered for exterior RV applications including holding tank installations, roof repairs, and weatherproofing joints where traditional silicone sealants fail.

Features & Specifications

• Permanently Flexible Formula - Remains pliable through temperature extremes and road vibration without cracking or hardening
• Superior Adhesion - Bonds to glass, metals, concrete, wood, masonry, and select plastics without primer on most clean surfaces
• Excellent Weathering Properties - Resists UV degradation, moisture, and temperature cycling for long-lasting exterior protection
• Non-Stringing, Non-Staining - Easy to apply and tool with a standard caulking gun, leaves clean professional finish
• 10.3 fl oz (305 ml) Cartridge - Standard size fits all caulking guns, black color blends with most RV exteriors
• Single Component System - No mixing required, ready to use straight from the cartridge
• Solvent Release Technology - Skins over quickly to protect against contaminants while curing

Why Choose Adcoseal B-100 Butyl Rubber Sealant?

Unlike generic silicone or acrylic sealants that crack and fail under RV conditions, Adcoseal B-100 is purpose-built for the unique demands of recreational vehicle applications. The butyl rubber formula maintains its flexibility through freeze-thaw cycles, road vibration, and UV exposure that would destroy ordinary sealants. Whether you're sealing a fresh water tank installation, repairing roof penetrations, or weatherproofing exterior joints, B-100 provides the professional-grade adhesion and durability that ensures your repair lasts for years. RV technicians choose B-100 for critical sealing applications because it delivers consistent performance across multiple substrate types without the need for expensive primers or surface treatments.

Compare RV Sealants

Choosing the right sealant for your RV repair depends on the application, substrate compatibility, and performance requirements. Here's how Adcoseal B-100 compares to other professional RV sealants:

Pro Tip: For tank installations and exterior joints requiring multi-substrate adhesion, butyl rubber sealants like B-100 offer superior flexibility and longevity compared to silicone. For vertical applications where sag resistance is critical, consider the Alpha N2100 non-sag formula.

Technical Specifications

• Product Name: Adcoseal B-100 Butyl Rubber Sealant
• SKU: B100
• Barcode: 51381656
• Cartridge Size: 10.3 fl oz (305 ml)
• Color: Black
• Base Chemistry: Single-component butyl rubber, solvent release
• Application Temperature: Room temperature recommended for optimal gunning
• Skin Time: Forms protective skin before full cure
• Support Time: Minimum 8 hours for tooled or joined surfaces
• Compatible Substrates: Glass, metals, concrete, wood, masonry, some plastics
• Application Method: Standard caulking gun, 45° angle, constant pressure
• Cleanup: Mineral spirits or VM&P Naphtha (before skin forms)
• Country of Origin: United States
• Weight: 1 lb

What's Included

• One (1) Adcoseal B-100 Butyl Rubber Sealant cartridge - 10.3 oz
• Application instructions printed on cartridge
• Manufacturer quality assurance

Note: Standard caulking gun required (not included). Primer may be required for certain surfaces - test adhesion on a small area before full application.

Application Instructions

Surface Preparation

• Ensure all surfaces are clean, dry, and free from contaminants including oil, grease, dirt, and loose material
• Remove old sealant completely if replacing existing seal
• Test adhesion on a small area if substrate compatibility is uncertain
• Apply primer if recommended for specific substrate (consult technical data sheet)

Application Process

1. Load cartridge into standard caulking gun
2. Cut nozzle at 45° angle to desired bead size (start small, can always enlarge)
3. Puncture inner seal with wire or nail
4. Use sealant at room temperature for easiest application and smooth flow
5. Hold gun at 45° angle to joint and apply with constant, steady pressure
6. Maintain consistent bead size and avoid gaps or air pockets
7. Tool or smooth bead immediately before skin forms (use wet finger or tool)
8. If bonding two surfaces, join within working time and support for minimum 8 hours
9. Clean excess material immediately with mineral spirits or VM&P Naphtha
10. Allow full cure time before exposing to weather or stress

Limitations & Important Notes

• Not recommended for window glazing applications or hidden joints requiring non-skinning, non-hardening sealant
• Primer may be required for optimal adhesion on certain plastics or porous surfaces
• Do not apply to wet, frozen, or contaminated surfaces
• Not suitable for continuous water immersion applications
• Test compatibility with plastics before full application as some formulations may affect certain polymers

Compatible Models & Alternatives

Adcoseal B-100 is the professional choice for RV tank installations and exterior sealing. For specialized applications, consider these complementary products:

• Alpha N2100 All-Purpose RV Sealant - Non-sag formula for vertical surfaces and sidewall repairs
• ICON White Butyl Sealant - Self-leveling white sealant for skylight installations and white roof applications
• Alpha Q130 Butyl Tape - Gasket tape for trim and rail installations, 100% VOC free
• RV Tank Fittings Collection - Complete selection of tank hardware and installation accessories

Frequently Asked Questions

How do I apply Adcoseal B-100 for best results?

For optimal results, ensure surfaces are completely clean and dry, apply at room temperature using a standard caulking gun at a 45° angle with constant pressure, and tool the bead immediately before it skins over. Support bonded surfaces for at least 8 hours before subjecting to stress or movement.

Is Adcoseal B-100 compatible with RV holding tanks?

Yes, B-100 is specifically designed for RV tank installations and exterior sealing applications. Its butyl rubber formula provides excellent adhesion to the metals, plastics, and composites commonly used in RV tank construction, and maintains flexibility through temperature extremes and road vibration.

What's the difference between butyl rubber sealant and silicone?

Butyl rubber sealants like B-100 remain permanently flexible and provide superior adhesion to a wider range of substrates without primers. Unlike silicone, butyl sealants are paintable, offer better resistance to UV degradation, and maintain their seal through extreme temperature cycling and mechanical stress common in RV applications.

Can I use B-100 on vertical surfaces or will it sag?

B-100 has moderate sag resistance and works well on horizontal and slightly angled surfaces. For vertical applications, sidewalls, or overhead joints where sag resistance is critical, consider the Alpha N2100 non-sag formula which is specifically designed for those applications.

How long does Adcoseal B-100 take to cure?

B-100 forms a protective skin relatively quickly (within hours depending on temperature and humidity), but bonded or tooled surfaces should be supported for a minimum of 8 hours. Full cure time varies with temperature, humidity, and joint depth - allow 24-48 hours before exposing to weather or mechanical stress.

What surfaces require primer before applying B-100?

Most clean, dry surfaces including glass, metals, concrete, wood, and masonry bond well without primer. However, certain plastics, porous materials, or contaminated surfaces may require primer for optimal adhesion. Always test on a small area first, and consult the technical data sheet for specific substrate recommendations.

Why Buy from Elkhart RV Parts?

When you purchase Adcoseal B-100 from Elkhart RV Parts, you're getting 100% authentic OEM-grade product backed by our commitment to quality and customer satisfaction. We are an authorized distributor of professional RV components, ensuring you receive genuine products with full manufacturer support. Our team understands RV systems and can provide expert guidance on product selection and application. We offer fast shipping, secure packaging to prevent damage, and responsive customer support to answer your technical questions.