3M 7000120477 Marine Grade Silicone Sealant Clear

Product Description

The 3M 7000120477 is a marine-grade silicone sealant formulated for use in saltwater, freshwater, and outdoor coastal environments where standard sealants fail prematurely. It cures to a flexible, mildew-resistant seal that does not yellow over time, making it well suited for exposed topside and below-deck applications. The sealant comes in a 1/10 gallon cartridge in clear finish and is applied with a standard caulk gun. Marine technicians, boat builders, and experienced tradespeople working on watercraft or dockside structures rely on this product where long-term flexibility and weather resistance are required.

This sealant is intended for marine and coastal construction applications where joints, seams, and penetrations are exposed to UV radiation, standing water, salt spray, and wide temperature cycles. Typical uses include sealing deck hardware, hatches, portlights, and through-hull fittings. It performs in both residential boating and commercial marine service environments. The clear formulation allows it to blend into a wide range of substrates without visible color contrast.

Key Features

• Marine-grade silicone formulation resistant to saltwater, UV exposure, and temperature cycling
• Mildew-resistant cure — suitable for wet, humid, and below-deck environments
• Non-yellowing over time, maintaining a clean appearance on light-colored surfaces
• Remains flexible after curing, accommodating joint movement without cracking
• Packaged in a 1/10 gallon cartridge compatible with standard caulk guns
• Clear finish blends with most substrates

Compatibility

Designed as a general-purpose marine-grade silicone sealant suitable for use on fiberglass, metal, glass, and painted surfaces commonly found in marine and coastal construction applications.

Installation Notes

Application should be performed by a qualified marine technician or tradesperson familiar with sealant work. Surfaces must be clean, dry, and free of old sealant, grease, and oxidation before application. A standard caulk gun is required for dispensing from the cartridge format. Allow full cure time before exposing the joint to water or mechanical stress — do not rush cure by applying water or coatings over uncured sealant.

Technical Specifications

• Package Size: 1/10 gallon cartridge
• Color: Clear
• Sealant Type: Silicone
• Application Environment: Marine grade
• Weight: 0.83 pounds
• UPC: 00051135080290

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000120477