Model # 5203

Internet #100161471

Store SKU #285848

3M 3 oz. Marine Adhesive Sealant


3 oz. Marine Adhesive Sealant

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Frequently Bought Together

Product Overview

Check the bonding and sealing jobs this product can handle for you: fiberglass deck to fiberglass hull, wood to fiberglass, portholes and deck fittings, motors on fiberglass transoms, under moldings, hull seams above and below water line. Use Between struts and planking, stern joints, deck housing, center board trunk joints, etc. Easy to apply with manual caulking gun. Remains workable with trowel or spatula up to 4 hours after application.

California residents: see   Proposition 65 information

Info & Guides

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Individual size (oz.)


Caulk Features
Moisture Resistant,Permanently Flexible,Tintable
Caulk Form
Standard Tube
Caulk Type
Coverage (linear ft.)
Cure time (hours)
Dry color family
Dry to touch (min.)
Longevity (years)
Paint Product Type
Professional Paint Supplies & Values
Pro Supplies

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty

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Customer Questions & Answers

Trying to seal a pool light. Will this last underwater?

Asked by: Aaron
Do not use this on anything that you may want to remove later without destroying one or both items.
Answered by: JonB
Date published: 2016-08-23

im wanting to attach a 2x4 to the top of my pop up camper lid for bicycle mounts will it hold at 60mph down highway

Asked by: Scott
If the 2x4 comes off it will be because the surface layer of the top separated from the layers underneath, not because the adhesive failed. This stuff is permanent if the material to which it is attached does not fail. You could attach your bike to your F-16 if you have one.
Answered by: JonB
Date published: 2016-08-25

Can this product be used as an adhesive sealant in a shower?

Asked by: Steve
There are several variables we would like to discuss first. Please call our team at 1.877.366.2746 M-F 8am-4:30pm CT so our team can get some specifics and be sure this product will meet your needs. Thanks for reaching out, and we look forward to your call.
Answered by: 3M Social Engagement
Date published: 2015-12-27

Will this work with attaching pennies to mesh for kitchen backsplash? Thank you

Asked by: Pattie
That's an interesting application and we appreciate you asking! Please connect with our 3M Marine Team to be sure it will meet your needs prior to purchase by calling 1-877-366-2746 8am-4:30pm CT. Thanks again, and we look forward to your call.
Answered by: 3M DIY
Date published: 2017-06-20
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Customer Reviews

3 oz. Marine Adhesive Sealant is rated 5.0 out of 5 by 8.
Rated 5 out of 5 by from Bonding wood to shiny metal surface Bought this glue to bond wood to a shiny metal magnet. Worked like a charm. Just a dab will do it.
Date published: 2017-05-08
Rated 5 out of 5 by from Does it have any resistance to petrol ? I have used the #5200 dozens times, on my repair service, and I can truly say it's the best, and the fun thing is I keep finding uses for it. I just want to see if you could put it on a plastic gas tank and seal a few small holes.
Date published: 2017-03-22
Rated 5 out of 5 by from Strong and paintable Used for the keel of my wooden/classic boat as the seam started to seperate and the guard was not able to secure to the boat. WOW - unreal how strong this bond is for wood.
Date published: 2017-04-12
Rated 5 out of 5 by from Mr I have been using this product around the house and farm for over 7 years. It is remarkable! My first use of the product was when I discovered two lines leaking on my brother's hot tub. The tub had been installed in such a manner as to make it impossible to replace the plastic pipes unless the tub was completely disconnected and removed. Had to crawl into a very narrow space to apply. Tub was back in operation in 3 days and never leaked again. Since that time I have used it for numerous repairs of PBC pipe and fiberglass containers both in out buildings, portable equipment lines and on equipment cattle watering lines. It has enough flex and strength to withstand the bumping by cattle without breaking for long periods of time. The secret of the successful use, though, is always to allow more “set time” than indicated on the tube.
Date published: 2010-10-27
Rated 5 out of 5 by from Good boot adhesive The rubber soles of my boots were de-laminating from the leather body. I searched a few hiking forums, and 5200 was one of the recommended adhesives to repair it. I can verify it works really well! I treated it like any other adhesive, including clamping it for 24 hours. Then went on a 20 mile hike, and all is well. It holds and it is waterproof. Too bad the store doesn't carry the black color version. Also, a smaller package at a cheaper price would be nice for these one-shot jobs. But that's nit picking. It was still a lot cheaper than throwing the boots away or professional repair.
Date published: 2012-10-04
Rated 5 out of 5 by from Removing 5200 Easy to remove. Use a heat gun to warm the part (if possible) then use the heat gun to heat the putty knife blade as hot as possible, Push the blade through the adhesive - reheat the blade and repeat as neded. That is how we boaters do it.
Date published: 2012-09-22
Rated 5 out of 5 by from PERMANENT! 3m makes 3000, 4000, 42000 and 52000. This is 5200, it is PERMANENT. do not use if you ever want to take something apart... ever! It is used to put the deck on hulls of boats! 95% of the time a consumer really wants 4000 or 4200, both are very strong but will come apart if need be. About the only way to get past 5200 once it has cured is with a piano wire saw, and that presumes you can get to it with a piano wire saw.
Date published: 2011-08-27
Rated 5 out of 5 by from Great for sealing holes on boat I thought this stuff worked really well, a bit hard ot clean up but I guess that is what makes it a good product.
Date published: 2015-06-23
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