Search  for anything...
3M

3M Marine Adhesive Sealant 5200 (05203) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 3 fl oz Tube

  • Based on 10,492 reviews
Condition: New
Checking for the best price...
$19.98 Why this price?
Save $6.06 was $26.04

Buy Now, Pay Later

As low as $4 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Aug 12
Order within 20 hours and 33 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Color: White


Size: 3 fl oz


Features

  • 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
  • EASY TO APPLY Adhesive sealant requires no mixing, cures completely in 5-7 days
  • For industrial/occupational use only. Not for consumer sale or use

Description

3M Marine Adhesive Sealant 5200 is a tough, flexible polyurethane for permanent bonding and sealing your RV, boat or other watercraft. It is ideal for use on wood, gelcoat, fiberglass, metal and more. It is recommended for interiors, below the waterline and any other places that are shielded from sunlight. It applies right from the container – no mixing is required. It becomes tack-free in 48 hours, and cures to form a firm, flexible, waterproof seal on joints and boat hardware. Far more than a marine caulk, tough, flexible Marine Adhesive 5200 dissipates stress caused by vibration and shock, and won’t crack under dynamic force. It resists saltwater, wind, weather and temperature extremes for long periods of worry-free enjoyment on the water. In fact, for more than 50 years, 3M Marine Adhesive Sealant 5200 has been used and trusted as a marine sealant by professionals in some of the most demanding conditions on earth. Polyurethane sealants provide strong, flexible durable elastomeric bonds that seal against the elements. These sealants excel in challenging industrial, transportation and construction applications. Polyurethane sealants are available in a wide variety of Shore A hardness, open time and colors to meet many application needs. Choose a 3M Manual or Pneumatic Applicator for dispensing 3M adhesives sealant cartridges and 400ml/600ml sausage packs.

Material: Plastic


Brand: 3M


Style: 5200


Item Weight: 0.14 Kilograms


Item dimensions L x W x H: 2 x 5 x 9 inches


Brand Name: 3M


Unit Count: 3.0 Fluid Ounces


Number of Items: 1


Part Number:


Model: 5203


Item Type Name: 3M Marine Adhesive Sealant 5200 (05203) – Permanent Bonding and Sealing for Boats and RVs – White – 3 Ounces


Manufacturer: 3M


Included Components: ADHESIVE SEALANT


Water Resistance Level: Waterproof


Item Form: Paste


Compatible Material: Fiberglass, Wood


Item Weight: 0.14 Kilograms


Item Dimensions: 2 x 5 x 9 inches


Style Name: 5200


Color: White


Material Type: Plastic


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Aug 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Good solid product
Color: White Size: 1 fl oz
Great product. Works well at keeping water out but don’t get on your clothes. It will be there forever.
Reviewed in the United States on June 5, 2026 by Phillip richey
    • Great stuff
Color: Black Size: 10 fl oz
Great stuff! I saw other reviews that people did not get the nozzle, but mine had it. The tube is metal and the base of my tube was dented but it didn't prevent me from being able to use it. Be aware it takes 7 days to cure, and stays tacky for a couple of days. If you get any own your project or on your hands rubbing alcohol removes it when it's wet. ... show more
Reviewed in the United States on April 30, 2026 by bb007p
    • Absolutely amazing product
Color: White Size: 10 fl oz
Purchased this product to attempt to seal a challenging flashing issue which has three different material in an awkward transition. I removed all the material from the previous two attempts to waterproof the area, leaving a larger than previous opening to work this material into. After cleaning and prepping the surfaces, I began to applying this 3M product. It is thick, but not problematic to dispense - possibly other reviewers were dispensing through a smaller orifice than me - I used the full tube opening without a tip. The product is exceptionally easy to manipulate and smooth out - almost putty like. Unlike other products like silicone and polyurethane, it didn't stick much to my applicator and thus stayed were I wanted it (without sag) and also smoothed out easily. Bottom line is it adhered to all three materials, filled the voids perfectly, looks great, and the leak is no more! I highly, highly recommend this product - it's amazing! ... show more
Reviewed in the United States on April 4, 2026 by CAc4s
    • Good Product Good Product
Color: White Size: 10 fl oz
Review Image by aqua mark
Review Image by aqua mark
The product is great, but it was missing the cap so I had to return it.
Reviewed in the United States on June 17, 2026 Reviewed in the United States on June 17, 2026 by aqua mark
    • Poke a hole in the end and cut the tip off a little at an angle
Color: White Size: 10 fl oz
Works great Takes forever to dry (defiantly not 3! more like 4-days -1 Star*)!! I got mine with the tip!! No holes, came just fine!! Stuff is great!! Strong with a little flex to it. Think caulk with strength.. For the reviewer talking about the tip not working? ?Poke a hole in the end of the tube! You do have to cut the end off on the nipple you screwed on!! Also there is a pop top lip on the bottom, you have to pull that off as well. Looks like you figured that out ok? But Yes you do have to cut the tip off and ----> poke a hole in the end of the tube as well!! Before screwing the nipple on!! So here is a recap... Poke a hole in the end where the tip screws on and cut the tip off the nozzle a little at an angle and pull the pop top pull lid off the bottom. Done P.S. Could have put my project together with just this no need for rivets as I was using Composite Aluminum Panels.. ... show more
Reviewed in the United States on June 18, 2025 by A. Myers
    • Very good at sealing big holes
Color: White Size: 10 fl oz
Perfectly sealed up the bottom of my boat that had a half dollar coin sized hole in it. The adhesive can be extremely hard to work with but you get the hang of it pretty quick.
Reviewed in the United States on June 29, 2026 by Jack
    • TAKES 7 DAYS TO CURE
Color: Black Size: 10 fl oz
TAKES 7 DAYS TO CURE Needed to reseal my 12v 100ah lifepo4 battery. My battery design is pretty dumb and they put the handle on the top lid which was only sealed with the bare minimum of a few dabs of some type of similar adhesive on the side that came undone. The only downside to ordering it online was that the nozzle was cracked at the bottom and broken off of the retainer ring but the nozzle was still usable. Ive used the 3m 5200 adhesive sealant before so I already knew what to expect. If you can use caulk gun you can use this..but make sure you dont get it on you or its really hard to get off. Gas will work but it sucks lol. i do wish I had gotten the 3m 5200FC that cures in 24 hours instead though. ... show more
Reviewed in the United States on June 23, 2026 by AstroPhoto
    • All around waterproof adhesive, perfect for exterior applications and boats.
Color: White Size: 10 fl oz
This is the perfect waterproof adhesive for built up marine plywood laminated boat building. I used it on a curved balcony wall and it was stronger than a post and rail assembly. There is a learning curve as it will be stiff in cold weather and a tad soft above 75°. Very strong bond.
Reviewed in the United States on May 20, 2026 by Stephen Ortado

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...