3M Marine Grade Silicone Sealant, Clear, 304 mL Cartridge, 12/Case

• Adheres to bare and painted metal, fiberglass, glass, non-oily woods, many plastics and abraded rubber
• For above the waterline interior/exterior sealing
• High quality silicone sealant
• Mildew resistant, non-yellowing, non-sagging formula
• Moisture-curing

3M Marine Grade Silicone Sealant is formulated specifically for above-the-waterline sealing on RVs, boats and personal watercraft. Ideal for hatches, dashboard components, deck hardware, portlights and many other uses inside or out, it features a non-shrinking formula that forms a strong elastomeric bond and stays firm, tough yet flexible even in tough environments. Apply this silicone sealant to paint, fiberglass, bare metal, glass and non-oily wood as well as many plastics and abraded rubber. It resists all types of weather including high temperatures, and fights the growth of mildew which can cause degrading and discoloration. It also won’t turn yellow over time, preserving the sharp, professional look of your boat or other watercraft. It won’t sag, making it easy to apply even on vertical surfaces. It requires no mixing and applies right from the container. This boat sealant becomes tack-free in as little as 20 minutes, and fully cures in 24 to 48 hours so you can get right back out on the water.

Withstands Harsh Marine Environments
Providing a high-quality seal, 3M™ Marine Grade Silicone Sealant is a one-component cure, silicone sealant engineered to withstand the harsh marine environment. This weather-resistant sealant is formulated to resist mildew and form a non-yellowing seal for above waterline applications. In addition, this marine sealant is high-temperature resistant and remains flexible even after years of exposure. The non-shrinking and non-sagging properties of this product offer simple and efficient application. This marine-grade sealant adheres to bare and painted metal, fiberglass, glass, non-oily woods, plastics and abraded rubbers.

Recommended Applications

• Electrical hatch sealing
• Dashboard components
• Port lights
• Above the waterline interior/exterior sealing

Designed to Endure Marine Environments
3M™ Marine Grade Silicone Sealant is a part of a broad range of adhesive sealants uniquely formulated for the marine market. 3M™ Marine Grade Silicone Sealant is designed for reliable sealing performance in harsh marine environments.

Understanding Adhesive Sealants
Adhesive sealants provide strong, flexible durable elastomeric bonds that seal against the elements. These sealants excel in challenging industrial, transportation and construction applications. Choose a 3M Manual or Pneumatic Applicator for dispensing 3M adhesives sealant cartridges.

Bringing Better Ideas to the Surface through Science and Innovation
In our 3M Industrial Adhesives and Tapes Division, we apply the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, our technologies help customers like you deliver competitive products to the market faster and more efficiently.

Trusted 3M Marine Sealant

The 3M Marine Grade Silicone Sealant, Clear, 304 mL Cartridge, 12/Case offers a reliable solution for sealing needs. This high-quality silicone sealant is designed specifically for marine use, ensuring durability and strong adhesion.

Its clear formula works well on various surfaces, including bare and painted metal, fiberglass, and glass. The 304 mL cartridge format makes application straightforward, while the pack of 12 ensures you have enough for multiple projects.

Clear Durable Sealant Formula

This marine-grade sealant features a clear, non-yellowing formula that maintains a professional look over time. It resists mildew and won’t sag during application, making it ideal for vertical surfaces.

Its moisture-curing properties allow it to become tack-free in as little as 20 minutes and fully cure within 24 to 48 hours. This ensures a strong, flexible bond that lasts in tough marine environments.

Versatile Above Waterline Use

Designed for above the waterline interior and exterior sealing, this sealant is perfect for boats, RVs, and personal watercraft. It adheres well to a variety of materials such as non-oily woods, plastics, and abraded rubber.

Common applications include sealing electrical hatches, dashboard components, portlights, and deck hardware. The 3M Marine Grade Silicone Sealant supports many sealing tasks above the waterline.

Convenient Cartridge Packaging

The 304 mL cartridge format allows for easy, mess-free application right from the container. No mixing is required, which saves time and reduces waste during use.

Sold in cases of 12 cartridges, this pack size is ideal for professionals and enthusiasts who need consistent supply for multiple sealing jobs or larger projects.

Strong Flexible Marine Bond

This silicone sealant forms a strong elastomeric bond that remains flexible even after years of exposure to harsh marine conditions. It withstands high temperatures and resists shrinking or sagging.

Its durability ensures long-lasting protection against weather and moisture, making it a dependable choice for maintaining the integrity of marine equipment and watercraft.