Elastomeric Marine Sealant

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Key Features:

  • One component, marine grade, synthetic rubber which dries by solvent evaporation.
  • Provides great adhesion to fiberglass, glass, most plastics, metal and wood
  • For use above and below the waterline
  • Paintable, Sand-able and more easily cleaned than polyeurethane sealers like Sikaflex
  • Advantages
  • Paintable and Sandable
  • No primer required
  • Fast skinning (10 min), fast curing (24-hours)
  • Outstanding adhesion to fiberglass, glass, plastics, metal and wood
  • Used above or below waterline
  • Easier to remove than polyurethane (i.e. 5200)
  • Permanent flexibility
  • 50% joint movement

  • Limitations
  • Allow minimum of one week for full cure prior to total water immersion situations or painting
  • Do not use as a deck seam sealant
  • Not recommended for wooden decks
  • Not recommended for use in areas subject to regular gasoline contact
  • Elastomeric generally has good resistance to teak cleaners and oils, however it is advisable to test a small area for compatibility and resistance.
  • Behind doors and storage unit frames
  • Thru hull fittings (above and below water line)
  • Deck hardware, windshields
  • Ports, hatches, rails and chain plates
  • Anywhere else a high quality marine grade adhesive is required

    10 oz Cartridge Yields:
  • 156 linear feet of 1/8" bead
  • 39 linear feet of 1/4" bead

    3 oz Tube Yields:
  • 46 linear feet of 1/8" bead
  • 11 linear feet of 1/4" bead

    Clean Up: Uncured elastomeric is easily removed with mineral spirits. Fully cured sealant is only removed mechanically

    Shelf life: 36 months

    Application Temperature: 40°F - 130°F

    Tack-Free to Touch: 10 minutes at 70°F and 50% RH

    Full Cure: 1-7 days

    Chemical Resistance: Long-term; water, diluted acids and alkalies Short-term; solvent and strong acid

    Shore Hardness: 30

    Tensile Strength: 350 p.s.i

Does this work on Starboard? Sudbury elastomeric sealant adheres to Starboard much better than silicone. It is the recommended adhesive for sealing/waterproofing behind starboard frames on tackle boxes and doors. With that said, it is not a substitute for mechanical fasteners and should not be used as the only means of structurally adhering starboard.

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Nice finishing touch
Great product! Perfect match.
The seafoam sealant was perfect match for seafoam King Starboard in making these tops for pontoon.
The seafoam sealant was perfect match for seafoam King Starboard in making these tops for pontoon.
August 28, 2019
5 months ago
awesome sealant
The sealant work perfect for what I needed it for
May 15, 2019
8 months ago
Questions / Answers
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Browse 6 questions Browse 6 questions and 5 answers
I need to re glaze windows on a 2001 Ocean Yachts 52SS...prior owner used black silicone in some areas and it’s deteriorating. Can I use your product?
Carlos S on Feb 26, 2019
Will this work when installing screws for a bow railing on a Whaler?
joe c on Dec 30, 2018
BEST ANSWER: Hi Joe, The Elastomeric Sealant is perfect for installing screws above or below the waterline.
I need to seal stainless steel panels (12) in an in ground pool. It is below the water line when fully filled. Will this work?
Phyllis G on Apr 10, 2019
BEST ANSWER: Absolutely will work, excellent product needs to cure for 24 hrs before you cover with water
will this product fasten starboard to aluminum boat below waterline?
A shopper on May 7, 2018
BEST ANSWER: Hello, nothing really bonds well to Starboard so I would not recommend using any type of adhesive alone to attach a piece of Starboard to a mounting surface.
I am going to replace my Lenco edgemount trim tabs and will be using a sealant for the screws and for sealing between the trim tab hinge and the transom. Is this a good enough product for this job?
Ed Z on Apr 28, 2018
BEST ANSWER: Hello Ed, the elastomeric sealant on the is a very good adhesive sealant and is intended for use above and below the waterline so this should work great for your application. Please let us know if you have any other questions or if there is anything else we can do for you.
How well would Sudbury Elastomeric Marine Sealant work as a home bathroom caulk? I need to seal around the circumference of a sink that's slightly raised from its countertop (made of some kind of epoxy, I think), and I also need to seal a slight gap between the sink countertop and a vertical backsplash at the rear of the countertop. I also need to seal around the top of a tub where it meets the wall tile. The usual bathroom/kitchen/tub & tile caulks all have issues (some get yellow, moldy, don't smooth well especially if they're made mainly or only of silicone, etc.), so I figured maybe Sudbury's product might avoid these problems.
John S on May 27, 2019
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