[Aleks]

It is no secret that vessels are subjected to enormous loads during operation and can react with various deformations. Exposure to fresh and saltwater and ultraviolet rays has a considerable impact on the service life of boats. Therefore, marine sealants should be necessarily used in vessels’ construction and repair. Boat sealants are used to protect various areas on small boats and larger ships. They are applied for sealing window openings, deck, and hull seams. Sealants have also proved to be efficient for riveted and bolted joints of the vessel.

[helen123]

In this article, we will review the 5 best marine sealants and tell you about the main properties of the boat sealants you can find on the market. here

[Koon]

Since the scope of work of the sealant on the boat is rather large, the requirements for its quality are also high. Sealants for seawater must create elastic vibration-resistant sealed seams, which in turn have elasticity in order not to undergo various types of shrinkage and temperature deformations. Moreover, such sealants must have high adhesion to almost any material, must be resistant to sea and freshwater, ultraviolet radiation, and be durable in operation.

[Prado]

Source? What are they sealing with it? [links]

[hvac001]

It is an adhesive as well as a sealant just like Six stated, otherwise they wouldn't market it for below water line fittings. more

[DataPacRat]

Post by KingDarius » 06 Feb 2012, 16:57

[plusjeans]

If you would by an aluminum boat that's been "sealed" with 5200 from the manufacture. well. I'll just stop there. [links]

[yuooo]

Hurricane, Bennington, Polarkraft, Hydrasports, Mako, Nitro, Tracker, Ranger, Triton, Bass Cat, Lund, Alumacraft, Big O boats, Sterling, Crestliner, Boston Whaler, Cobalt, Nautic Star, Four Winns, Rinker, South Bay, Lowe, Cobia [links]

[HopeFlynn7x]

Source? Me. I've personally assembled thousands of things using 5200 to seal, for a boat company, that Sea Fox bought out, and I have personally worked on a dozen different boats using it. And have deconstructed probably 1/2 dozen-same story.

[tomdetroit]

- Marine Goop has a tensile strength of 3500 PSI, (also has UV inhibitors)
- U-6800 is also a Goop product @ 3500 PSI, only supposed to have better adhesion, also has UV inhibitors
- 3M's tensile strength is 600 or 900 PSI (slow or fast cure) and from all accounts is unaffected by UV.

[epaulson]

The question is not how strong they are, but which will stick to the aluminum better.

[maniexx]

So, has anybody actually used this to fix rivets?

[AleС™ Janda]

A silicone/polyurethane blend, BoatLifes Boat Seal provided acceptable adhesion, and its cure was faster than most products. [links]

[atti]

Butyl tape did not meet the criteria for this test, but it is worthy of mention for several reasons. Although it has almost no tensile strength-requiring hardware fasteners-this bedding material has more than enough adhesion for sealing off deck penetrations like hatches. And because it has no strength, you can easily pry up even the largest hatch for repair or replacement. Mineral spirits can easily remove the last traces of butyl, but there is no need to do this if youre just bedding a new hatch. Just remove as much as is practical and apply more. This tape lasts forever in the toolbox, and very little cleanup is required. After tightening the hardware, simply trim the excess with a plastic knife.

[privacyshark]

Our main criteria for a marine caulk is that it should not peel from the substrate (adhesive failure), but rather it should fail by shearing and tearing. Products that do not adhere to the substrate are useful only for hardware that is well-secured by mechanical fasteners.

[jenifrer]

Polyurethane caulks are one of the most popular types of marine caulks. Their adhesiveness, long life, and resistance to water make them useful for bonding and high-adhesion bedding applications both above and below the waterline. Not all are designated for below-the-waterline use, however, so be sure to match the product for the job.

[arturekert02]

Heat-treating polyethylene (Starboard and similar products) prior to bonding yielded significant improvements in peel strength for this difficult-to-bond material. It is an old sign-makers trick, but its relatively unknown to sailors.