10 Best Marine Grade 5200 Sealant of 2025

Tested and Reviewed: Top 10 Marine Grade 5200 Sealant deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

3M

3M 7000000623 Marine Adhesive Sealant - 10 oz., White

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Editor's bottom line:

“This marine grade 5200 sealant is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Permanent bonding above and below the waterline
Industry standard for over 50 years
Offers extended working time
Achieves handling strength in 48 hours
Tough and flexible polyurethane polymer forms strong bonds

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Picked by 273 people today

Best Value

9.5

Save 15%

3M

3M Marine Adhesive Sealant 5200 - Permanent Bonding and Sealing for Boats and Marine Applications - Black - 3 Ounces

15% OffFree Shipping

Main Highlights

POWERFUL MARINE SEALANT: A permanent solution for bonding marine substrates like wood, fiberglass, and metal
VERSATILE APPLICATIONS: Tough yet flexible polyurethane polymer is ideal for deck housings, hull fittings, porthole mounting, fiberglass transoms, and underside molding
WARD OFF WATER: Resists saltwater and weathering both above and below the water line
FLEXIBLE BONDS: Its elastomeric bond absorbs the stress of vibration, swelling, shrinking, and shock
LONG WORKING TIME: Allows plenty of working time, achieving handling strength in 48 hours

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9.5

FORTIVO

5200 Marine Sealant - Fast-Cure, High-Bond, UV-Resistant Underwater Marine Adhesive Sealant for Boats, Hulls, Decks, and RVs - with Gloves, Nozzle, White 10 oz

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Main Highlights

High Load Bearing Capacity: Engineered for heavy-duty marine applications, this 5200 marine sealant ensures permanent & secure adhesion on various surfaces. As a top marine adhesive and marine grade sealant, it provides reliable performance for all your needs.
UV Protected, All-Weather Shield: This marine grade adhesive offers superior protection against sun damage & discoloration, maintaining sealant integrity. Ideal for marine caulking for boats, this marine sealant below waterline ensures durable sealing in the toughest environments.
Rapid 24-Hour Cure: This marine sealant white achieves full strength & durability within a day, allowing for fast project turnaround and minimal downtime. This marine adhesive sealant is tack-free in just 2 hours, ensuring quick and reliable results.
Versatile Marine Sealant: Suitable for use on fiberglass, gelcoat, wood, and other marine substrates, making this marine grade silicone sealant perfect for deck fittings, through-hull fastenings, and railings.
Easy Application: Featuring a pre-attached nozzle and a pair of nitrile gloves, this marine 5200 sealant makes application simple and clean. This professional and DIYer-friendly underwater sealant is designed for hassle-free use in all your projects.

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9.2

Berkland

10 oz Marine Adhesive Sealant 5200 Fast Cure (White) - Permanent, Watertight Bonding and Sealing - UV Resistant, Above & Below Waterline - Compare to 05203 and 06520 FC M - by Berkland

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Main Highlights

PROFESSIONAL GRADE PERMANENT SEAL - When it comes to your boat, RV or home, you don't want to take chances. Our marine adhesive provides watertight bonding and sealing for fiberglass / gelcoat and wood. Creates watertight, weather-resistant, UV-resistant seals on boat hardware, joints and more. Gloves Included.
PERMANENT BONDING AND SEALING - Our marine adhesive creates a strong, permanent bond that still maintains just enough flexibliity. Perfect for use on deck fittings, through-hull fastenings, railings, transducers and more. Holds up well during vibration, movement and shock
FAST CURE, ABOVE AND BELOW WATERLINE - Unlike many marine adhesives, our 5200 FC cures within 24 hours. Works for areas above AND below the waterline. Compare to other brand's 5200 Fast Cure / FC sealants, including 05203 and 06520
UV-RESISTANT, LONG LASTING - No more worrying about a sealant that degrades with sun exposure - our marine sealant holds up. Does not degrade in a high sunlight/UV exposure environment. Resistant to weathering and degradation in either saltwater or freshwater environments
EASY APPLICATION - A single-component sealant that requires NO mixing. Solvent-free, Non-toxic, Low VOC. No cracking or peeling! 10oz tube, white sealant. Gloves Included.

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9.0

Berkland

10 oz Marine Adhesive Sealant 5200 Fast Cure (Black) - Permanent, Watertight Bonding and Sealing - UV Resistant, Above & Below Waterline - Compare to 05203 and 06520 FC M - by Berkland

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Main Highlights

PROFESSIONAL GRADE PERMANENT SEAL IN [BLACK] - When it comes to your boat, RV or home, you don't want to take chances. Our marine adhesive provides watertight bonding and sealing for fiberglass / gelcoat and wood. Creates watertight, weather-resistant, UV-resistant seals on boat hardware, joints and more. Gloves Included.
PERMANENT BONDING AND SEALING - Our marine adhesive creates a strong, permanent bond that still maintains just enough flexibliity. Perfect for use on deck fittings, through-hull fastenings, railings, transducers and more. Holds up well during vibration, movement and shock
FAST CURE, ABOVE AND BELOW WATERLINE - Unlike many marine adhesives, our 5200 FC cures within 24 hours. Works for areas above AND below the waterline. Compare to other brand's 5200 Fast Cure / FC sealants, including 05203 and 06520
UV-RESISTANT, LONG LASTING - No more worrying about a sealant that degrades with sun exposure - our marine sealant holds up. Does not degrade in a high sunlight/UV exposure environment. Resistant to weathering and degradation in either saltwater or freshwater environments
EASY APPLICATION - A single-component sealant that requires NO mixing. Solvent-free, Non-toxic, Low VOC. No cracking or peeling! 10oz tube, BLACK sealant. Gloves Included. To get started, peel the metal tab off the bottom of the tube and remove the ball. Then, load into your caulking tool.

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8.8

FORTIVO

[Black] 5200 Marine Sealant - Fast Cure, High Bond Strength, UV Resistant Underwater Sealant, Marine Adhesive Sealant for Boats, Hulls, Decks, & RVs Marine Sealant Black with Gloves, Nozzle 10oz

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Main Highlights

High Load Bearing Capacity: Engineered for heavy-duty marine applications, this 5200 marine sealant ensures permanent & secure adhesion on various surfaces. As a top marine adhesive and marine grade sealant, it provides reliable performance for all your needs.
UV Protected, All-Weather Shield: This marine grade adhesive offers superior protection against sun damage & discoloration, maintaining sealant integrity. Ideal for marine caulking for boats, this marine sealant below waterline ensures durable sealing in the toughest environments.
Rapid 24-Hour Cure: This marine sealant white achieves full strength & durability within a day, allowing for fast project turnaround and minimal downtime. This marine adhesive sealant is tack-free in just 2 hours, ensuring quick and reliable results.
Versatile Marine Sealant: Suitable for use on fiberglass, gelcoat, wood, and other marine substrates, making this marine grade silicone sealant perfect for deck fittings, through-hull fastenings, and railings.
Easy Application: Featuring a pre-attached nozzle and a pair of nitrile gloves, this marine 5200 sealant makes application simple and clean. This professional and DIYer-friendly underwater sealant is designed for hassle-free use in all your projects.

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8.6

3M

3M Marine Adhesive Sealant Fast Cure 5200 (05220) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 3 fl oz Tube

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Main Highlights

CURES FAST One-part adhesive sealant requires no mixing, typically cures within 48 hours so you can get back on the water faster
USE WHAT THE PROS USE Extremely strong adhesive sealant retains strength above or below waterline
BONDS PERMANENTLY Ideal for sealing, bonding and attaching on the interiors of boats and RVs, or on exteriors below the waterline and where shielded from the sun
LONG LASTING FORMULA Tough polyurethane polymer resists weathering and salt water
WONT CRACK OR PEEL Stays flexible, retaining strong bonds even during vibration, structural movement or shock
For industrial/occupational use only. Not for consumer sale or use

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8.3

FORTIVO

[Black] 5200 Marine Sealant - Fast Cure, High Bond Strength, UV Resistant Underwater Sealant, Marine Adhesive Sealant for Boats, Hulls, Decks, & RVs Marine Sealant Black with Gloves, Nozzle 3oz

Free Shipping

Main Highlights

High Load Bearing Capacity: Engineered for heavy-duty marine applications, this 5200 marine sealant ensures permanent & secure adhesion on various surfaces. As a top marine adhesive and marine grade sealant, it provides reliable performance for all your needs.
UV Protected, All-Weather Shield: This marine grade adhesive offers superior protection against sun damage & discoloration, maintaining sealant integrity. Ideal for marine caulking for boats, this marine sealant below waterline ensures durable sealing in the toughest environments.
Rapid 24-Hour Cure: This marine sealant white achieves full strength & durability within a day, allowing for fast project turnaround and minimal downtime. This marine adhesive sealant is tack-free in just 2 hours, ensuring quick and reliable results.
Versatile Marine Sealant: Suitable for use on fiberglass, gelcoat, wood, and other marine substrates, making this marine grade silicone sealant perfect for deck fittings, through-hull fastenings, and railings.
Easy Application: Featuring a pre-attached nozzle and a pair of nitrile gloves, this marine 5200 sealant makes application simple and clean. This professional and DIYer-friendly underwater sealant is designed for hassle-free use in all your projects.

Show Price

8.1

Berkland

3 oz Marine Adhesive Sealant 5200 Fast Cure (White) - Permanent, Watertight Bonding and Sealing - UV Resistant, Above & Below Waterline - Compare to 05203 and 06520 FC M - by Berkland

Free Shipping

Main Highlights

Professional Grade - When it comes to your boat, you don't want to take chances. Our marine adhesive provides watertight bonding and sealing for fiberglass / gelcoat and wood. Creates watertight, weather-resistant, UV-resistant seals on boat hardware, joints and more
Permanent Bonding and Sealing - Our marine adhesive creates a strong, permanent bond that still maintains just enough flexibliity. Perfect for use on deck fittings, through-hull fastenings, railings, transducers and more. Holds up well during vibration, movement and shock
Fast Cure, Above and Below Waterline - Unlike many marine adhesives, our 5200 FC cures within 24 hours. Work for areas above AND below the waterline. Compare to other brand's 5200 Fast Cure / FC sealants, including 05203 and 06520
UV-Resistant, Long Lasting - No more worrying about a sealant that degrades with sun exposure - our marine sealant holds up. Does not degrade in a high sunlight/UV exposure environment. Resistant to weathering and degradation in either saltwater or freshwater environments
Easy Application - A single-component sealant that requires NO mixing. Solvent-free, Non-toxic, Low VOC. No cracking or peeling! 3oz tube, white sealant. By Berkland

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8.1

FORTIVO

5200 Marine Sealant - Fast-Cure, High-Bond, UV-Resistant Underwater Marine Adhesive Sealant for Boats, Hulls, Decks, and RVs - with Gloves, Nozzle, White 3 oz

Free Shipping

Main Highlights

High Load Bearing Capacity: Engineered for heavy-duty marine applications, this 5200 marine sealant ensures permanent & secure adhesion on various surfaces. As a top marine adhesive and marine grade sealant, it provides reliable performance for all your needs.
UV Protected, All-Weather Shield: This marine grade adhesive offers superior protection against sun damage & discoloration, maintaining sealant integrity. Ideal for marine caulking for boats, this marine sealant below waterline ensures durable sealing in the toughest environments.
Rapid 24-Hour Cure: This marine sealant white achieves full strength & durability within a day, allowing for fast project turnaround and minimal downtime. This marine adhesive sealant is tack-free in just 2 hours, ensuring quick and reliable results.
Versatile Marine Sealant: Suitable for use on fiberglass, gelcoat, wood, and other marine substrates, making this marine grade silicone sealant perfect for deck fittings, through-hull fastenings, and railings.
Easy Application: Featuring a pre-attached nozzle and a pair of nitrile gloves, this marine 5200 sealant makes application simple and clean. This professional and DIYer-friendly underwater sealant is designed for hassle-free use in all your projects.

Show Price

Our Best Overall Choice

Best Choice

9.7

3M

3M 7000000623 Marine Adhesive Sealant - 10 oz., White

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Permanent bonding above and below the waterline
Industry standard for over 50 years
Offers extended working time
Achieves handling strength in 48 hours
Tough and flexible polyurethane polymer forms strong bonds

Show Price

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