Saturday, June 19, 2021

Know Your Boat: How to Choose Boat Sealant

Boat owners agree the right sealant for your boat’s care and maintenance is essential. You don’t want to spring a leak while out in the water. That’s a recipe for disaster!

Whether aluminum or inflatable, boats are subject to wear and tear. The maintenance is demanding. But with the right sealants, the longevity and efficiency of your boat will increase.

Investing in the right boat sealant will save you money in the long run because you won’t have the need to buy a new boat. Instead, you can make your current boat brand new with the sealants you choose.

Marine Sealant

This repairs boat leaks, cracks, and dents. They’re waterproof and repel molds and mildew. They’re great due to their ability to stick to various surfaces.

They work on glass, non-oily wood, and bare metals amongst others. It’s flexible, so its adhesion is reliable for movements and vibrations. Marine sealant blocks noise and the rush of electricity.

You can apply it anywhere water could penetrate. They’re long-lasting due to their sealing being durable and sturdy. The water-tight seal can go on more than one type of surface at a time.

Many manufacturers sell marine sealants, so decide which is best for your boat. There are five types of marine sealants: silicone, polysulfide, polyurethane, butyl, and hybrid.


Silicone sealing works as a great insulator when used to make gaskets. In the presence of UV rays and heat, the silicone remains unchanged. Making it a favorite item for boat maintenance.

You can’t use it underneath the waterline since the adhesion is weak. Best to use the sealant above the waterline since it’s easy to remove for modifications.


Polysulfide sealing produces a strong mechanical bond. Especially while combating UV rays and the presence of oil or fuel. Polysulfide protects from weathering and is a great electrical insulator.

The sealant is strong in resisting vibration, temperature, impact, and shock. It’s flexible for movements, so it’s useful for bedding, antennae basing, and searchlights.


Polyurethane sealing works above and below the waterline. It’s beneficial for resisting harsh UV light. It’s used in installing hull-to-deck joints, struts, and external keel attachments.

It’s an adhesive rather than a sealer. Since it’s more practical for permanent bonding. It lacks resistance to acids and oils used in cleaning products, so don’t use on plastic materials.


This sealant looks like tape but is like chewing gum. It can be easily applied, removed, and doesn’t make a mess.

It can last about 20 years, but it’s weak against UV rays. You won’t be able to use this below the waterline either.


Manufacturers combine pro elements of certain sealants to create this one. Silicone combined with the strength of polyurethane creates a better sealant bond.

What about hatches?

Finding the right product to repair boat hatches shouldn’t be a problem. Fathom Bay is your guide for re-bedding hatches. You can speak with fellow boat owners about their solutions for boat maintenance.

If a boat hatch isn’t maintained, you’ll have constant leaks. You may even have to replace the boat hatch. This may cost you more than purchasing a sealant to re-bed the hatch.

Gung Ho

The ideal sealant for your boat’s maintenance is out there for you. Determine the needs of your boat as well as the amount of money you’re willing to invest.

It’s up to you to improve the longevity of your boat. Use the knowledge you’ve gained from this article and go buy a boat sealant.

Latest news

Related news

- Advertisement -spot_img


Please enter your comment!
Please enter your name here